0001628280-24-034769 | 10-Q | XBRL Viewer

Revenue

6 Months Ended

Jun. 30, 2024

Revenue from Contract with Customer [Abstract]

The Company recognizes product revenue from sales of HEPZATO in the United States and CHEMOSAT in certain European countries in accordance with the five-step model in Accounting Standards Codification (“ASC”) 606, Revenue Recognition: (i) identify contract(s) with a customer; (ii) identify the performance obligations in the contract; (iii) determine the transaction price; (iv) allocate the transaction price to the performance obligations in the contract; and (v) recognize revenues when (or as) the Company satisfies the performance obligation. Under this revenue standard, the Company recognizes revenue when its customer obtains control of the promised goods, in an amount that reflects the consideration which the Company expects to receive in exchange for those goods. There are no contractual rights of returns, refunds or similar obligations.

HEPZATO

The Company ships and sells the HEPZATO directly to hospitals and treating centers based on approved agreements. Prior to use of the HEPZATO, the inventory is considered on consignment in which the Company retains title to the product. The Company recognizes HEPZATO revenue, based on contracted rates stated in an approved contract or purchase order, upon completion of the procedure as evidenced through the Company’s required Risk Evaluation and Mitigation Strategy (“REMS”) system. There is no obligation for the hospitals or treating centers to use the consigned HEPZATO, and the Company has no contractual right to receive payment until the product is used in a procedure and transfer of control is completed. See Note 4 for further information for consignment inventory.

CHEMOSAT

CHEMOSAT is sold directly to hospitals in the European Union and United Kingdom based on contracted rates in an approved contract or sales order. The Company recognizes product revenue from sales of CHEMOSAT upon shipment.

Revenue by product for the periods indicated were as follows:


	Three Months Ended June 30,				Six Months Ended June 30,
(In thousands)	2024		2023		2024		2023
CHEMOSAT	$	1,196	$	495	$	2,327	$	1,092
HEPZATO KIT	6,570		—		8,578		—
Total revenue	$	7,766	$	495	$	10,905	$	1,092

Concentration of Credit Risk

Potential credit risk exposure for both HEPZATO KIT and CHEMOSAT has been evaluated for the Company’s accounts receivable in accordance with ASC 326, Financial Instruments - Credit Losses. The loss percentage is calculated through

the use of current and historical economic and financial information. As of June 30, 2024, there were no estimated losses applied to the accounts receivables balance.

The Company’s total percentage of revenue and accounts receivable concentrations from a single customer consisted of the following:


For the six months ended and as of	Revenue		Accounts Receivable
June 30, 2024	52.0	%	34.0	%
June 30, 2023	19.0	%	36.8	%

- Definition

The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-9

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
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-URI https://asc.fasb.org/1943274/2147479806/606-10-50-10

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org/1943274/2147479806/606-10-50-15

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Name Accounting Standards Codification
-Topic 606
-Publisher FASB
-URI https://asc.fasb.org/606/tableOfContent

+ Details

Stockholders' Equity

6 Months Ended

Jun. 30, 2024

Stockholders' Equity Note [Abstract]

Stockholders' Equity

Stockholders’ Equity

Public and Private Placements

Common Purchase Agreement

On March 27, 2023, the Company entered into a securities purchase agreement (the “Common Purchase Agreement”) with the Company’s Chief Executive Officer, Gerard Michel, pursuant to which the Company agreed to issue and sell, in a private placement (the “Common Offering”) shares of common stock, tranche A warrants (“Common Tranche A Warrants”) to acquire 31,110 shares of common stock, tranche B warrants (“Common Tranche B Warrants”, together with the Common Tranche A Warrants, the “Common Warrants”) to acquire 16,666 shares of common stock. On March 29, 2023, the Company closed the Common Offering.

The aggregate exercise price of the Common Tranche A Warrants issued pursuant to the Common Offering is approximately $0.1 million.

On August 14, 2023, the Company announced the receipt of the FDA Approval and all Common Tranche A Warrants were exercised and converted into 31,110 shares of common stock.

The aggregate exercise price of the Common Tranche B Warrants issued in the Common Offering is approximately $0.1 million. The Common Tranche B Warrants are exercisable for an aggregate of 16,666 shares of common stock until the earlier of 21 days following the Company’s announcement of receipt of recording at least $10 million in quarterly U.S. revenue from the commercialization of HEPZATO and March 31, 2026.

Securities Purchase Agreement

On March 14, 2024, the Company and certain accredited investors (each an “Investor” and collectively, the “Investors”) entered into a securities purchase agreement (the “Securities Purchase Agreement”) pursuant to which the Company agreed to sell and issue to the Investors in a private placement (the “Private Placement”) (i) an aggregate of 876,627 shares of the Company’s common stock, par value $0.01 per share, at a purchase price of $3.72 per share, and (ii) to certain investors, in lieu of shares of common stock, 1,008,102 pre-funded warrants (the “Pre-Funded Warrants”) at a price per Pre-Funded Warrant of $3.71 (the “Warrant Shares” and together with the Shares, the “Securities”) with an exercise price of $0.01. As of June 30, 2024 the Pre-Funded Warrants have been exercised in full.

The Private Placement closed on March 19, 2024. The Company received gross proceeds of approximately $7.0 million, before deducting offering expenses payable by the Company.

Registration Rights for Preferred and Common Offerings

Pursuant to the Preferred Purchase Agreement and the Common Purchase Agreement (collectively, the “Purchase Agreements”), the Company filed a registration statement on Form S-3 (the “June 2023 Resale Registration Statement”) providing for the resale by the investors party thereto of the common stock issuable upon conversion of the Registrable Shares (as defined in the Purchase Agreements). The June 2023 Resale Registration Statement became effective on June 28, 2023.

Pursuant to the Securities Purchase Agreement, the Company filed a registration statement on Form S-3 (the “April 2024 Resale Registration Statement”) providing for the resale of the common stock and common stock issuable upon the exercise of the Pre-Funded Warrants. The April 2024 Resale Registration Statement also provided for the common stock issued upon the exercise of pre-funded warrants to purchase common stock issued by the Company pursuant to the Avenue Amendment. The registration became effective on May 9, 2024.

There is no established public trading market for the Series F Preferred Stock, the Preferred Warrants, Common Warrants or the Pre-Funded Warrants and the Company does not intend to list such securities on any national securities exchange or nationally recognized trading system.

June 2024 Shelf Registration Statement

On June 28, 2024, the Company filed a universal shelf registration statement on Form S-3 (the “June 2024 Shelf Registration Statement”) with the SEC, pursuant to which the Company may offer, issue and sell any combination of shares of the Company’s common stock, par value $0.01 per share, shares of the Company’s preferred stock, par value $0.01 per share, debt securities, warrants to purchase common stock, preferred stock and/or debt securities, in one or more series, and units consisting of any combination of the other types of securities registered under such June 2024 Shelf Registration Statement in an aggregate amount of up to $150 million, in each case, to the public in one or more registered offerings.

At-the-Market Offering

The Company previously entered into a Controlled Equity OfferingSM Sales Agreement (“ATM Sales Agreement”), with Cantor Fitzgerald & Co. (the “Sales Agent”), pursuant to which the Company may offer and sell, at its sole discretion through the Sales Agent, shares of its common stock from time to time. Pursuant to a prospectus supplement (the “ATM Prospectus Supplement”), filed with the SEC on February 27, 2023, the Company could sell shares of common stock under the ATM Sales Agreement up to an aggregate of $17.0 million. To date, the Company has sold approximately $4.0 million of its common stock, prior to issuance costs, under the ATM Sales Agreement. No sales were made during the three or six months ended June 30, 2024.

The registration statement of which the ATM Prospectus Supplement forms a part expired on July 1, 2024 and the Company can no longer make sales under the ATM Prospectus Supplement. The Company may file a new prospectus supplement with respect to the ATM Sales Agreement, or with respect to a similar arrangement, in the future.

Authorized Shares

The Company is authorized to issue 80 million shares of common stock, $0.01 par value, and 10 million shares of preferred stock, $0.01 par value. As of June 30, 2024, the Company has designated the following preferred stock:


Designated Preferred Shares						June 30, 2024
Series A						4,200
Series B						2,360
Series C						590
Series D						10,000
Series E						40,000
Series E-1						12,960
Series F-1						24,900
Series F-2						24,900
Series F-3						34,860
Series F-4						24,900
Total						179,670

Preferred Stock

As of June 30, 2024, there were an aggregate of 11,257 shares of Series E and Series E-1, 1,085 Series F-2 and no shares of Series F-3 or Series F-4 Convertible Preferred Stock outstanding, respectively.

Omnibus Equity Incentive Plan

On September 30, 2020, the Company’s 2020 Omnibus Equity Incentive Plan (the “2020 Plan”) was adopted by the Company’s Board of Directors. On November 23, 2020, the Company’s stockholders approved the 2020 Plan. The 2020 Plan will continue in effect until the tenth anniversary of the date of its adoption by the Board or until earlier terminated by the Board. The 2020 Plan is administered by the Board of Directors or a committee designated by the Board of Directors. The 2020 Plan provides for the grant of incentive stock options, non-qualified stock options, stock appreciation rights, restricted stock awards, restricted stock unit awards, performance awards, as well as other stock-based awards or cash awards that are deemed to be consistent with the purposes of the plan to Company employees, directors and consultants. As of June 30, 2024, there have been 7,125,000 shares of common stock reserved under the 2020 Plan, which includes an additional 2,000,000 shares approved by shareholders on May 23, 2024 and registered on a Form S-8 registration statement, filed with the SEC on June 28, 2024, of which 2,140,327 remained available to be issued.

In addition to options granted from the 2020 Plan, the Company also grants employment inducement awards pursuant to Listing Rule 5635(c)(4) of the corporate governance rules of the Nasdaq Stock Market. The inducement grants are intended to provide incentive to certain individuals to enter into employment with the Company. Prior to December 5, 2023, the inducement awards were granted outside of the 2020 Plan, however they are governed in all respects as if they were issued under the 2020 Plan. These grants do not reduce the number of options available for issuance under the 2020 Plan.

On December 5, 2023, the Company’s 2023 Inducement Plan (the “2023 Plan”) was adopted by the Company’s Board of Directors. The 2023 Plan is administered by a Compensation Committee of two or more Independent Directors appointed by the Board of Directors and is intended to provide for the grant of non-qualified stock options, stock appreciation rights, restricted stock awards, restricted stock unit awards, performance awards, as well as other stock-based awards or cash awards that are deemed appropriate to incentivize employment with the Company. Awards from the 2023 Plan can only be granted to individuals who have not previously worked for the Company or have not worked for the Company for a bona fide period of time. As of June 30, 2024, there have been 650,000 shares of common stock reserved under the 2023 Plan, of which 339,000 remain available to be granted.

Stock Options

The following tables include information for all options granted including inducement grants that are granted outside of the 2020 Plan.

The Company values stock options using the Black-Scholes option pricing model and used the following assumptions, on a weighted-average basis, during the reporting periods:


	Six Months Ended June 30,
	2024	2023
Expected terms (years)	5.5	5.7
Expected volatility	114.3%	161.6%
Risk-free interest rate	4.22%	3.94%
Expected dividends	0.00%	0.00%

The following is a summary of stock option activity for the six months ended June 30, 2024:


	Number of Options	Weighted Average Exercise Price Per Share		Weighted Average Grant Date Fair Value Per Share		Weighted Average Remaining Contractual Term (in years)	Aggregate Intrinsic Value (in thousands)
Outstanding at January 1, 2024	4,183,232	$	8.17	$	7.60	8.3	$	147
Granted	2,213,096	5.01		4.09		9.5
Exercised	(32,300)	5.22		4.15			60
Expired	(46,956)	8.63		8.34
Cancelled/Forfeited	(184,958)	5.88		5.49
Outstanding at June 30, 2024	6,132,114	$	7.11	$	6.41	8.4	$	12,902

Exercisable at June 30, 2024	2,995,121	$	8.95	$	8.17	7.4	$	3,443
Unvested at June 30, 2024	3,136,993	$	5.36	$	4.73	9.3	$	9,459

The following table summarizes information for stock option shares outstanding and exercisable at June 30, 2024:


		Options Outstanding
Range of Exercise Prices	Outstanding Number of Options	Weighted Average Remaining Option Term (in years)	Number of Options
$2.83 - $51.50	6,131,615	8.4	6,131,615
$51.50+	499	3.8	499
	6,132,114	8.4	6,132,114

The following is a summary of share-based compensation expense in the statement of operations:


	Three Months Ended June 30,				Six Months Ended June 30,
(In thousands)	2024		2023		2024		2023
Selling, general and administrative	$	1,930	$	911	$	3,971	$	2,099
Research and development	895		651		1,543		1,068
Cost of goods sold	244		99		500		155
Total	$	3,069	$	1,661	$	6,014	$	3,322

At June 30, 2024, there was $8.3 million of aggregate unrecognized compensation expense related employee and board stock option grants. The cost is expected to be recognized over a weighted average period of 1.1 years.

Common Stock Warrants

The following is a summary of common stock warrant activity for the six months ended June 30, 2024:


	Warrants	Weighted Average Exercise Price		Weighted Average Remaining Life (in years)
Outstanding at January 1, 2024	4,665,201	$	7.76	1.6
Warrants issued1	1,008,102	0.01
Warrants exercised	(1,308,473)	0.01
Outstanding and exercisable at June 30, 2024	4,364,830			1.1

1All warrants issued in 2024 have been exercised and therefore have no remaining life.

The following table presents information related to common stock warrants outstanding at June 30, 2024:


		Warrants Exercisable
Range of Exercise Prices	Outstanding Number of Warrants	Weighted Average Remaining Warrant Term (in years)	Number of Warrants
$0.01	737,421	3.1	737,421
$6.00	16,666	1.8	16,666
$10.00	3,610,743	0.7	3,610,743
	4,364,830	1.1	4,364,830

Preferred Stock Warrants

The following is a summary of preferred stock warrant activity for the six months ended June 30, 2024:


	Warrants	Weighted Average Exercise Price		Weighted Average Remaining Life (in years)
Outstanding at January 1, 2024	24,900	$	1,000	2.3
Warrants issued	—
Warrants exercised	(250)	1,000
Outstanding and exercisable at June 30, 2024	24,650	$	1,000	1.8

Employee Stock Purchase Plan

In August 2021, the Company’s Board of Directors, with shareholder approval in May 2022, adopted the Employee Stock Purchase Plan (the “ESPP”). The ESPP provides for a maximum of 260,295 shares of common stock to be purchased by participating employees of which 62,575 have been issued as of June 30, 2024 since the inception of the benefit in 2021. Employees who elect to participate in the ESPP will be able to purchase common stock at the lower of 85% of the fair market value of common stock on the first or last day of the applicable six-month offering period.

- Definition

The entire disclosure for equity.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

Stockholders' Equity - Schedule of Assumptions to Estimate Fair Value of Stock Options Using Black-Scholes Option Pricing Model (Details)	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Stockholders' Equity Note [Abstract]
Expected terms (years)	5 years 6 months	5 years 8 months 12 days
Expected volatility	114.30%	161.60%
Risk-free interest rate	4.22%	3.94%
Expected dividends	0.00%	0.00%

Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Prepaid Expense and Other Assets, Current [Abstract]
Clinical trial expenses	$ 222	$ 222
Insurance premiums	145	157
Professional services	657	133
Interest Receivable	23	151
Other	404	428
Total prepaid expenses and other current assets	$ 1,451	$ 1,091

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Current assets
Cash and cash equivalents	$ 14,782	$ 12,646
Restricted cash	0	50
Short-term investments	5,124	19,808
Accounts receivable, net	3,726	241
Inventory	6,316	3,322
Prepaid expenses and other current assets	1,451	1,091
Total current assets	31,399	37,158
Property, plant and equipment, net	1,422	1,352
Right-of-use assets	1,092	103
Total assets	33,913	38,613
Current liabilities
Accounts payable	3,279	1,012
Accrued expenses	4,418	5,249
Lease liabilities, current	103	37
Loan payable	0	5,239
Convertible notes payable	4,491	4,911
Total current liabilities	12,291	16,448
Warrant liability	15,809	5,548
Lease Liabilities, non-current	989	0
Other liabilities, non-current	632	840
Total liabilities	29,721	22,836
Commitments and contingencies (see Note 14)
Stockholders’ equity
Preferred stock, $0.01 par value; 10,000,000 shares authorized; 12,342 and 24,819 shares issued and outstanding at June 30, 2024 and December 31, 2023, respectively	0	0
Common stock, $0.01 par value; 80,000,000 shares authorized; 27,931,393 shares and 22,761,554 shares issued and outstanding at June 30, 2024 and December 31, 2023, respectively	279	228
Additional paid-in capital	533,919	520,576
Accumulated deficit	(530,014)	(505,162)
Accumulated other comprehensive loss	8	135
Total stockholders’ equity	4,192	15,777
Total liabilities and stockholders’ equity	$ 33,913	$ 38,613

Fair Value Measurements - Schedule of Financial Assets and Liabilities Measured at Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Assets:
Total Assets	$ 10,590	$ 20,200
Liabilities:
Contingent Liability	750	996
Warrant Liabilities	15,809	5,548
Total Liabilities	16,559	6,544
Money market funds
Assets:
Investments	5,466	392
U.S. government agency bonds
Assets:
Investments	5,124	19,808
Quoted Prices in Active Markets (Level 1)
Assets:
Total Assets	5,466	392
Liabilities:
Contingent Liability	0	0
Warrant Liabilities	0	0
Total Liabilities	0	0
Quoted Prices in Active Markets (Level 1) \| Money market funds
Assets:
Investments	5,466	392
Quoted Prices in Active Markets (Level 1) \| U.S. government agency bonds
Assets:
Investments	0	0
Significant Other Observable Inputs (Level 2)
Assets:
Total Assets	5,124	19,808
Liabilities:
Contingent Liability	0	0
Warrant Liabilities	0	0
Total Liabilities	0	0
Significant Other Observable Inputs (Level 2) \| Money market funds
Assets:
Investments	0	0
Significant Other Observable Inputs (Level 2) \| U.S. government agency bonds
Assets:
Investments	5,124	19,808
Significant Unobservable Inputs (Level 3)
Assets:
Total Assets	0	0
Liabilities:
Contingent Liability	750	996
Warrant Liabilities	15,809	5,548
Total Liabilities	16,559	6,544
Significant Unobservable Inputs (Level 3) \| Money market funds
Assets:
Investments	0	0
Significant Unobservable Inputs (Level 3) \| U.S. government agency bonds
Assets:
Investments	$ 0	$ 0

Stockholders' Equity - Summary of Recognized Share-based Compensation Cost (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based compensation expense	$ 3,069	$ 1,661	$ 6,014	$ 3,322
Unrecognized compensation expense related to non-vested share-based compensation awards	8,300		$ 8,300
Cost expected to be recognized over weighted average period			1 year 1 month 6 days
Selling, general and administrative
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based compensation expense	1,930	911	$ 3,971	2,099
Research and development
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based compensation expense	895	651	1,543	1,068
Cost of goods sold
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Share-based compensation expense	$ 244	$ 99	$ 500	$ 155

Income Taxes	6 Months Ended
Income Taxes	Jun. 30, 2024
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes As discussed in “Note 17—Income Taxes” to the notes to the consolidated financial statements contained in the Annual Report, the Company has a valuation allowance against the full amount of its net deferred tax assets. The Company currently provides a valuation allowance against deferred tax assets when it is more likely than not that some portion or all of its deferred tax assets will not be realized. The Company has not recognized any unrecognized tax benefits in its balance sheet. The Company is subject to income tax in the U.S., as well as various state and international jurisdictions. The federal and state tax authorities can generally reduce a net operating loss (but not create taxable income) for a period outside the statute of limitations in order to determine the correct amount of net operating loss which may be allowed as a deduction against income for a period within the statute of limitations. Additional information regarding the statutes of limitations can be found in Note 17 - Income Taxes of the Company’s Annual Report. The Inflation Reduction Act of 2022 included tax legislation that became effective in the first quarter of 2023. Significant legislation for corporate taxpayers includes a corporate alternative minimum tax of 15% for companies with $1 billion or more in average net financial statement profits over the three previous years, as well as a 1% indirect excise tax on the repurchase of shares by a publicly traded company. The Company does not expect this legislation to have an effect on the tax provision as of June 30, 2024, however the Company will continue to evaluate the effect on the tax provision each reporting period.

- Definition

The entire disclosure for income tax.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-12

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 231
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482663/740-10-55-231

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12C
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-12C

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-12B

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 270
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477891/740-270-50-1

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 6.I.5.Q1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479360/740-10-S99-1

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480990/946-20-50-13

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(h)(2))
-Publisher FASB
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-Name Accounting Standards Codification
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-URI https://asc.fasb.org/740/tableOfContent

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 14
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-14

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 21
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-21

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
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-Subparagraph (b)
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-URI https://asc.fasb.org/1943274/2147482685/740-10-50-17

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 11.C)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479360/740-10-S99-2

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482603/740-30-50-2

+ Details

Net Loss per Share - Narrative (Details) - shares	Jun. 30, 2024	Jun. 30, 2023
Earnings Per Share [Abstract]
Pre-funded penny warrants outstanding (in shares)	737,421	1,037,792

Investments

6 Months Ended

Jun. 30, 2024

Investments, Debt and Equity Securities [Abstract]

Investments

Marketable debt securities held by the Company are classified as available-for-sale pursuant to ASC 320, Investments - Debt and Equity Securities, and carried at fair value in the accompanying condensed consolidated balance sheets.

The following table summarizes the gross unrealized gains on the Company’s marketable securities as of June 30, 2024:


	June 30, 2024
			Gross Unrealized
(In thousands)	Amortized Cost		Gains		Estimated Fair Value
U.S. government agency bonds	$	5,100	$	24	$	5,124
Short-term investments					$	5,124

As of June 30, 2024, there was less than $0.1 million of interest receivable related to the outstanding debt securities held by the Company.

The following table summarizes the gross unrealized gains on the Company’s marketable securities as of December 31, 2023:


	December 31, 2023
			Gross Unrealized
(in thousands)	Amortized Cost		Gains		Estimated Fair Value
U.S. government agency bonds	$	19,651	$	157	$	19,808
Short-term investments					$	19,808

As of December 31, 2023, there was $0.2 million of interest receivable related to the outstanding debt securities held by the Company.

Fair Value Measurements

6 Months Ended

Jun. 30, 2024

Fair Value Disclosures [Abstract]

Fair Value Measurements

The table below presents activity within Level 3 of the fair value hierarchy, our liabilities carried at fair value for the six months ended June 30, 2024:


	Level 3
(In thousands)	Contingent liabilities		Warrants		Total
Balance at January 1, 2024	$	996	$	5,548	$	6,544
Total change in foreign exchange	(25)		—		(25)
Warrant liability fair value adjustment	—		10,367		10,367
Change due to warrant exercise	—		(106)		(106)
Change due to liability payment	(221)		—		(221)
Balance at June 30, 2024	$	750	$	15,809	$	16,559

Contingent liabilities are re-measured to fair value each reporting period using projected financial targets, discount rates, probabilities of payment, and projected payment dates. Projected contingent payment amounts are discounted back to the current period using a discounted cash flow model. Projected financial targets are based on our most recent internal operational budgets and may take into consideration alternate scenarios that could result in more or less profitability for the respective service line. Increases or decreases in projected financial targets and probabilities of payment may result in significant changes in the fair value measurements. Increases in discount rates and the time to payment may result in lower fair value measurements. Increases or decreases in any of those inputs in isolation may result in a significantly lower or higher fair value measurement.

As disclosed in Note 10 and Note 11 of the Company’s consolidated financial statements, the Company allocated part of the proceeds of the Series F Preferred Offering to warrant liability issued in connection with the transaction. The valuations of the warrants were determined using option pricing models. The Company concluded that the Preferred Warrants were not in the scope of Accounting Standards Codification, Distinguishing Liabilities from Equity (ASC 480) since the Preferred Warrants are not mandatorily redeemable; and do not have obligations to issue a variable number of shares of preferred stock. The Company determined the Preferred Warrants met the definition of a derivative in accordance with ASC 815 but were not considered indexed to the Company’s common stock since the warrants require early settlement by repurchasing the preferred warrants for cash in an amount equal to the Black-Scholes value in the event of a Fundamental Transaction at pre-specified volatility of 100% as an input to the Black-Scholes calculation. The Company determined to record the Preferred Warrants at fair value with subsequent changes in fair value recorded in earnings at the end of each reporting period. For the three and six months ended June 30, 2024, the Company recorded an increase to other expense of $9.8 million and $10.4 million, respectively, related to the change in fair value of the warrant liability. These models use inputs such as the underlying price of the shares issued at the measurement date, volatility, risk free interest rate and expected life of the instrument. The Company has classified the warrants as a long-term liability due to potential provisions relating to the holders’ ability to exercise the warrants beyond twelve months of the reporting date.

The fair value of the preferred and common warrants at June 30, 2024 and December 31, 2023 was determined by using option pricing models assuming the following:


	June 30, 2024	December 31, 2023
Risk free interest rate	4.69%	4.09%
Expected term (years)	1.8	2.3
Expected volatility	60%	70%
Expected dividends	0.00%	0.00%

Additionally, the Company has determined that the warrant liability should be classified within Level 3 of the fair-value hierarchy by evaluating each input for the option pricing models against the fair-value hierarchy criteria and using the lowest level of input as the basis for the fair-value classification as called for in ASC 820. There are six inputs: closing price of the Company’s stock on the day of evaluation; the exercise price of the warrants; the remaining term of the warrants; the volatility of the Company’s stock along with comparable companies over that term; annual rate of dividends; and the risk-free rate of return. Of those inputs, the exercise price of the warrants and the remaining term are readily observable in the warrant agreements. The annual rate of dividends is based on the Company’s historical practice of not granting dividends. The closing price of the Company’s stock would fall under Level 1 of the fair-value hierarchy as it is a quoted price in an active market, the risk-free rate of return is a Level 2 input, while the historical volatility is a Level 3 input as defined in ASC 820-10. Since the lowest level input is a Level 3, the Company determined the warrant liability is most appropriately classified within Level 3 of the fair value hierarchy.

The following tables present information about the Company’s financial assets and liabilities that have been measured at fair value as of June 30, 2024 and December 31, 2023 and indicate the fair value hierarchy of the valuation inputs utilized to determine such fair value.


	June 30, 2024
(In thousands)	Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
Assets:
Money market funds	$	5,466	$	—	$	—	$	5,466
U.S. government agency bonds	—		5,124		—		5,124
Total Assets	$	5,466	$	5,124	$	—	$	10,590

Liabilities:
Contingent Liability	$	—	$	—	$	750	$	750
Warrant Liabilities	—		—		15,809		15,809
Total Liabilities	$	—	$	—	$	16,559	$	16,559


	December 31, 2023
(In thousands)	Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
Assets:
Money market funds	$	392	$	—	$	—	$	392
U.S. government agency bonds	—		19,808		—		19,808
Total Assets	$	392	$	19,808	$	—	$	20,200

Liabilities:
Contingent Liability	$	—	$	—	$	996	$	996
Warrant Liabilities	—		—		5,548		5,548
Total Liabilities	$	—	$	—	$	6,544	$	6,544

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 107
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482078/820-10-55-107

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 100
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482078/820-10-55-100

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6A
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
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-Name Accounting Standards Codification
-Section 50
-Paragraph 2E
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2E

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Section 50
-Paragraph 6A
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Section 50
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-URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
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-Name Accounting Standards Codification
-Section 50
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-URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
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Reference 12: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478119/940-820-50-1

+ Details

Net Loss per Share - Schedule of Potentially Dilutive Securities Excluded from the Computation of Earnings Per Share (Details) - shares	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	15,768,923	24,222,787
Common stock warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	3,627,409	3,658,520
Assumed conversion of preferred stock warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	4,108,328	11,896,667
Assumed conversion of preferred stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	1,454,509	4,051,637
Assumed conversion of convertible notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	446,563	488,031
Stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	6,132,114	4,127,932

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Cash flows from operating activities:
Net loss	$ (24,852)	$ (16,202)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock option compensation expense	6,014	3,322
Depreciation expense	62	59
Warrant liability fair value adjustment	10,367	(1,160)
Non-cash lease expense	37	195
Amortization of debt discount	447	388
Interest expense accrued related to convertible notes	80	80
Amortization of premiums and discounts on marketable securities	(379)	0
Changes in operating assets and liabilities:
Prepaid expenses and other assets	(488)	(306)
Accounts receivable	(3,485)	239
Inventory	(2,994)	(482)
Accounts payable and accrued expenses	1,339	132
Other liabilities, non-current	(183)	(177)
Net cash used in operating activities	(14,035)	(13,912)
Cash flows from investing activities:
Purchase of investment	(20,482)	0
Maturities of investments	35,540	0
Purchase of property, plant and equipment	(114)	(40)
Net cash provided by (used in) investing activities	14,944	(40)
Cash flows from financing activities:
Net proceeds from private placement	6,771	22,960
Proceeds from the issuance of common stock relating to the employee stock purchase plan	75	47
Repayment of debt	(6,107)	(6,313)
Proceeds from exercise of warrants	259	5
Proceeds from exercise of stock options	169	2
Net cash provided by financing activities	1,167	16,701
Foreign currency effects on cash	10	19
Net increase in total cash	2,086	2,768
Total Cash, Cash Equivalents and Restricted Cash:
Beginning of period	12,696	11,822
End of period	14,782	14,590
Cash, Cash Equivalents and Restricted Cash consisted of the following:
Cash and Cash Equivalents	14,782	14,540
Restricted Cash	0	50
Total	14,782	14,590
Cash paid during the periods for:
Interest expense	375	787
Supplemental Disclosure of Non-Cash Investing and Financing Activities:
Right of use assets obtained in exchange for lease obligations	1,029	84
Conversion of mezzanine equity to common shares	0	11,269
Conversion of mezzanine equity to preferred shares	$ 0	$ 7,099

Stockholders' Equity - At-the-Market Offering (Details) - A T M Sales Agreement - USD ($) $ in Millions	Jun. 30, 2024	Feb. 27, 2023
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Maximum aggregate offering amount		$ 17.0
Cumulative amount sold	$ 4.0

Prepaid Expenses and Other Current Assets

6 Months Ended

Jun. 30, 2024

Prepaid Expense and Other Assets, Current [Abstract]

Prepaid Expenses and Other Current Assets

Prepaid expenses and other current assets consist of the following:


(In thousands)	June 30, 2024		December 31, 2023
Clinical trial expenses	$	222	$	222
Insurance premiums	145		157
Professional services	657		133
Interest Receivable	23		151
Other	404		428
Total prepaid expenses and other current assets	$	1,451	$	1,091

Stockholders' Equity - Summary of Stock Option Shares Outstanding and Exercisable (Details) - $ / shares	6 Months Ended	12 Months Ended
	Jun. 30, 2024	Dec. 31, 2023
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Outstanding Number of Options (in shares)	6,132,114	4,183,232
Weighted Average Remaining Option Term (in years), Options Outstanding	8 years 4 months 24 days	8 years 3 months 18 days
Number of Options Outstanding (in shares)	6,132,114	4,183,232
$2.83 - $51.50
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Outstanding Number of Options (in shares)	6,131,615
Weighted Average Remaining Option Term (in years), Options Outstanding	8 years 4 months 24 days
Number of Options Outstanding (in shares)	6,131,615
$2.83 - $51.50 \| Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Range of Exercise Prices (in dollars per share)	$ 2.83
$2.83 - $51.50 \| Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Range of Exercise Prices (in dollars per share)	51.50
$51.50+
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Range of Exercise Prices (in dollars per share)	$ 51.50
Outstanding Number of Options (in shares)	499
Weighted Average Remaining Option Term (in years), Options Outstanding	3 years 9 months 18 days
Number of Options Outstanding (in shares)	499

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 35
-Paragraph 1D
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480483/718-10-35-1D

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Section 35
-Paragraph 3
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-URI https://asc.fasb.org/1943274/2147480483/718-10-35-3

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
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-Section 50
-Paragraph 2
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-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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-Section 50
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-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
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+ Details

Loans and Convertible Notes Payable - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands					1 Months Ended	3 Months Ended		6 Months Ended
	Aug. 14, 2023	Mar. 31, 2023	Mar. 15, 2023	Aug. 06, 2021	Jan. 31, 2024	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Debt Instrument [Line Items]
Restricted cash						$ 0	$ 50	$ 0	$ 50
Principal payments								6,107	6,313
Final payment								500
Proceeds from exercise of warrants								259	5
Loan outstanding						$ 4,491		$ 4,491		$ 10,150
Warrants issued to purchase of common stock (in shares)				127,755
Warrant exercise price (in dollars per share)		$ 0.01		$ 0.01
Number of warrants outstanding (in shares)		34,072
Series E
Debt Instrument [Line Items]
Debt instrument, conversion price (in dollars per share)				$ 1,198		$ 1,500		$ 1,500
Preferred Tranche A Warrant
Debt Instrument [Line Items]
Proceeds from exercise of warrants	$ 10,000
Avenue Loan
Debt Instrument [Line Items]
Debt instrument, principal face amount				$ 20,000
Basis spread on variable interest rate				7.70%
Stated interest rate				10.95%		16.20%		16.20%
Initial tranche of loan				$ 15,000
Loan amount funded into restricted account				$ 4,000
Restricted cash			$ 4,000
Principal payments			$ 2,100
Debt instrument, incremental final payment, percentage			4.25%
Final payment			$ 200
Estimated minimum proceeds on issue of common stock for extension of due date of interest only interest payments		$ 10,000
Principal payments					$ 1,000
Loan outstanding						$ 2,500		$ 2,500
Debt instrument, conversion price (in dollars per share)				$ 11.98
Amortization of debt discount						200	200	400	400
Interest expense incurred						100	300	400	800
Rosalind Notes
Debt Instrument [Line Items]
Debt instrument, principal face amount						$ 2,000		$ 2,000
Stated interest rate						8.00%		8.00%
Interest expense incurred						$ 100	$ 100	$ 100	$ 100

Stockholders' Equity - Summary of Common Stock Warrant Activity (Details) - Common Warrants - $ / shares	6 Months Ended	12 Months Ended
	Jun. 30, 2024	Dec. 31, 2023
Class Of Warrant Or Right Outstanding [Roll Forward]
Outstanding, beginning of period (in shares)	4,665,201
Warrants issued (in shares)	1,008,102
Warrants exercised (in shares)	(1,308,473)
Outstanding, end of period (in shares)	4,364,830	4,665,201
Weighted Average Exercise Price
Outstanding, beginning of period (in dollars per share)	$ 7.76
Warrants issued (in dollars per share)	0.01
Warrants exercised (in dollars per share)	0.01
Outstanding, ending of period (in dollars per share)		$ 7.76
Weighted Average Remaining Life (in years)
Weighted Average Remaining Life (in years), Outstanding	1 year 1 month 6 days	1 year 7 months 6 days

Accrued Expenses

6 Months Ended

Jun. 30, 2024

Payables and Accruals [Abstract]

Accrued Expenses

Accrued expenses consist of the following:


(In thousands)	June 30, 2024		December 31, 2023
Clinical expenses	$	419	$	1,129
Compensation, excluding taxes	2,302		1,859
Professional fees	165		272
Interest on convertible note	793		713
Inventory	8		585
Other	731		691
Total accrued expenses	$	4,418	$	5,249

Cover Page - shares	6 Months Ended
Cover Page - shares	Jun. 30, 2024	Jul. 29, 2024
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2024
Document Transition Report	false
Entity File Number	001-16133
Entity Registrant Name	DELCATH SYSTEMS, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	06-1245881
Entity Address, Address Line One	566 Queensbury Avenue
Entity Address, City or Town	Queensbury
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	12804
City Area Code	212
Local Phone Number	489-2100
Title of 12(b) Security	Common stock, $0.01 par value per share
Trading Symbol	DCTH
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		27,999,522
Entity Central Index Key	0000872912
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q2
Amendment Flag	false

Leases - Schedule of Operating Leases (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2024 USD ($)
Other information
Operating lease cost	$ 37
Operating cash flows for operating leases	(61)
U.S.
Other information
Operating lease cost	20
Operating cash flows for operating leases	$ (40)
Weighted average remaining lease term	9 years 7 months 6 days
Weighted average discount rate - operating leases	8.00%
Ireland
Other information
Operating lease cost	$ 17
Operating cash flows for operating leases	$ (21)
Weighted average remaining lease term	2 years 1 month 6 days
Weighted average discount rate - operating leases	8.00%

Stockholders' Equity - Securities Purchase Agreement (Details) - USD ($) $ / shares in Units, $ in Thousands				6 Months Ended
	Mar. 19, 2024	Mar. 14, 2024	Aug. 06, 2021	Jun. 30, 2024	Jun. 30, 2023	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Stockholders Equity Note [Line Items]
Common stock, par value (in dollars per share)				$ 0.01	$ 0.01	$ 0.01	$ 0.01	$ 0.01	$ 0.01
Warrants issued to purchase of common stock (in shares)			127,755
Warrant exercise price (in dollars per share)			$ 0.01					$ 0.01
Net proceeds from private placement				$ 6,771	$ 22,960
PreFundedWarrants
Stockholders Equity Note [Line Items]
Warrants issued to purchase of common stock (in shares)		1,008,102
Private Placement
Stockholders Equity Note [Line Items]
Net proceeds from private placement	$ 7,000
Private Placement \| PreFundedWarrants
Stockholders Equity Note [Line Items]
Warrants issued to purchase of common stock, price per warrant (in dollars per share)		$ 3.71
Warrant exercise price (in dollars per share)		$ 0.01
Common Stock \| Private Placement
Stockholders Equity Note [Line Items]
Stock issued during period, shares, new issues (in shares)		876,627
Common stock, par value (in dollars per share)		$ 0.01
Shares issued, price per share (in dollars per share)		$ 3.72

Commitments and Contingencies (Details) € in Millions, $ in Millions	May 01, 2024	Dec. 30, 2022 USD ($)	Jun. 30, 2024 USD ($)	Oct. 12, 2021 EUR (€)	Apr. 30, 2021 EUR (€)
Loss Contingencies [Line Items]
Milestone payment unpaid \| €				€ 1
Supply agreement, renewal option term	5 years
Purchase obligation, remainder of fiscal year			$ 2.4
Medac
Loss Contingencies [Line Items]
Accounts receivable \| €					€ 1
Term over which the royalty is to be paid		5 years
Minimum annual payments		$ 0.2
Medac \| Other Liabilities
Loss Contingencies [Line Items]
Loss contingency accrual			0.8
Medac \| Other Noncurrent Liabilities
Loss Contingencies [Line Items]
Loss contingency accrual			0.6
Medac \| Accrued Expenses
Loss Contingencies [Line Items]
Loss contingency accrual			$ 0.2

Condensed Consolidated Statements of Stockholders' Equity (Deficit) - USD ($) $ in Thousands	Total	Tranche B Warrants	Series F-1	Series F-2	Series F-3	Stock options	Employee Stock Purchase Plan	Preferred Stock	Preferred Stock Series F-2	Preferred Stock Series F-3	Common Stock	Common Stock Tranche B Warrants	Common Stock Series F-1	Common Stock Series F-2	Common Stock Series F-3	Additional Paid in Capital	Additional Paid in Capital Tranche B Warrants	Additional Paid in Capital Series F-1	Additional Paid in Capital Series F-2	Additional Paid in Capital Series F-3	Additional Paid in Capital Stock options	Additional Paid in Capital Employee Stock Purchase Plan	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)
Beginning balance (in shares) at Dec. 31, 2022								11,357			10,046,571
Beginning balance at Dec. 31, 2022	$ (5,859)							$ 0			$ 100					$ 451,608							$ (457,484)	$ (83)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Compensation expense						$ 1,661															$ 1,661
Private placement -issuance of common shares, net of expenses (in shares)											19,646
Private placement -issuance of common shares, net of expenses	56										$ 1					55
Issuance of common stock with the employee stock purchase plan (in shares)											15,417
Issuance of common stock with the employee stock purchase plan	47															47
Net loss	(9,000)																						(9,000)
Foreign currency translation adjustments	19																							19
Ending balance (in shares) at Mar. 31, 2023								11,357			10,081,634
Ending balance at Mar. 31, 2023	(13,076)							$ 0			$ 101					453,371							(466,484)	(64)
Beginning balance (in shares) at Dec. 31, 2022								11,357			10,046,571
Beginning balance at Dec. 31, 2022	(5,859)							$ 0			$ 100					451,608							(457,484)	(83)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(16,202)
Ending balance (in shares) at Jun. 30, 2023								20,981			15,250,469
Ending balance at Jun. 30, 2023	(242)							$ 0			$ 153					473,355							(473,686)	(64)
Beginning balance (in shares) at Mar. 31, 2023								11,357			10,081,634
Beginning balance at Mar. 31, 2023	(13,076)							$ 0			$ 101					453,371							(466,484)	(64)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Compensation expense						1,661															1,661
Conversion of shares (in shares)											538,828		4,629,539
Conversion of shares	5		$ 11,269								$ 5		$ 47					$ 11,222
Preferred F-2 Shares Issuance (in shares)									9,624
Preferred F-2 Shares Issuance				$ 7,099															$ 7,099
Stock option exercise (in shares)											468
Stock option exercise	2															2
Net loss	(7,202)																						(7,202)
Ending balance (in shares) at Jun. 30, 2023								20,981			15,250,469
Ending balance at Jun. 30, 2023	(242)							$ 0			$ 153					473,355							(473,686)	(64)
Beginning balance (in shares) at Dec. 31, 2023								24,819			22,761,554
Beginning balance at Dec. 31, 2023	15,777							$ 0			$ 228					520,576							(505,162)	135
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Compensation expense						2,895	$ 50														2,895	$ 50
Private placement -issuance of common shares, net of expenses (in shares)											876,627
Private placement -issuance of common shares, net of expenses	6,912										$ 8					6,904
Issuance of common stock with the employee stock purchase plan (in shares)											21,140
Issuance of common stock with the employee stock purchase plan	74															74
Conversion of shares (in shares)										(8,010)					1,779,998
Conversion of shares					$ 1										$ 18					$ (17)
Net loss	(11,111)																						(11,111)
Unrealized gain (loss) on investments	8																							8
Foreign currency translation adjustments	14																							14
Ending balance (in shares) at Mar. 31, 2024								16,809			25,439,319
Ending balance at Mar. 31, 2024	14,620							$ 0			$ 254					530,482							(516,273)	157
Beginning balance (in shares) at Dec. 31, 2023								24,819			22,761,554
Beginning balance at Dec. 31, 2023	$ 15,777							$ 0			$ 228					520,576							(505,162)	135
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock option exercise (in shares)	32,300
Net loss	$ (24,852)
Ending balance (in shares) at Jun. 30, 2024								12,342			27,931,393
Ending balance at Jun. 30, 2024	4,192							$ 0			$ 279					533,919							(530,014)	8
Beginning balance (in shares) at Mar. 31, 2024								16,809			25,439,319
Beginning balance at Mar. 31, 2024	14,620							$ 0			$ 254					530,482							(516,273)	157
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Compensation expense						$ 3,021	$ 48														$ 3,021	$ 48
Prior quarter private placement - expenses	(141)															(141)
Warrant exercise and conversion - F-4 Preferred to Common (in shares)												41,666
Warrant exercise and conversion - F-4 Preferred to Common		$ 355															$ 355
Conversion of shares (in shares)									(1,457)	(3,010)	1,307,706			441,514	668,888
Conversion of shares	10			$ 0	$ 0						$ 13			$ 4	$ 7	(3)			$ (4)	$ (7)
Stock option exercise (in shares)											32,300
Stock option exercise	169										$ 1					168
Net loss	(13,741)																						(13,741)
Unrealized gain (loss) on investments	(141)																							(141)
Foreign currency translation adjustments	(8)																							(8)
Ending balance (in shares) at Jun. 30, 2024								12,342			27,931,393
Ending balance at Jun. 30, 2024	$ 4,192							$ 0			$ 279					$ 533,919							$ (530,014)	$ 8

Stockholders' Equity - Summary of Employee Stock Purchase Plan (Details) - shares	1 Months Ended
	Aug. 31, 2021	Jun. 30, 2024
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Employee stock purchase plan, offering period	6 months
May 2022 Employee Stock Purchase Plan
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Share-based compensation arrangement by share-based payment award number of shares authorized (in shares)	260,295	62,575
Share-based compensation arrangement by share-based payment award purchase price of common stock (as a percent)	85.00%

Inventory (Tables)

6 Months Ended

Jun. 30, 2024

Inventory Disclosure [Abstract]

Schedule of Inventory

Inventory consists of the following:


(In thousands)	June 30, 2024		December 31, 2023
Raw materials	$	3,590	$	1,443
Work-in-process	2,162		1,753
Finished goods	564		126
Total inventory	$	6,316	$	3,322

Net Loss per Share

6 Months Ended

Jun. 30, 2024

Earnings Per Share [Abstract]

Net Loss per Share

Basic net loss per share is determined by dividing net loss by the weighted average shares of common stock outstanding during the period, without consideration of potentially dilutive securities, except for those shares that are issuable for little or no cash consideration. Diluted net loss per share is determined by dividing net loss by diluted weighted average shares outstanding. Diluted weighted average shares reflects the dilutive effect, if any, of potentially dilutive common shares, such as stock options and warrants calculated using the treasury stock method. In periods with reported net operating losses, all common stock options, convertible preferred shares, and preferred and common warrants are generally deemed anti-dilutive such that basic net loss per share and diluted net loss per share are equal.

The following potentially dilutive securities were excluded from the computation of earnings per share as of June 30, 2024 and 2023 because their effects would be anti-dilutive:


	June 30,
	2024	2023
Common stock warrants	3,627,409	3,658,520
Assumed conversion of preferred stock warrants	4,108,328	11,896,667
Assumed conversion of preferred stock	1,454,509	4,051,637
Assumed conversion of convertible notes	446,563	488,031
Stock options	6,132,114	4,127,932
Total	15,768,923	24,222,787

As of June 30, 2024 and 2023, the Company had 737,421 and 1,037,792 pre-funded warrants outstanding, respectively. The following table provides a reconciliation of the weighted average shares outstanding calculation for the three and six months ended June 30, 2024 and 2023:


	Three months ended June 30,		Six months ended June 30,
	2024	2023	2024	2023
Weighted average shares issued	27,317,256	11,320,450	25,511,315	10,693,762
Weighted average pre-funded warrants	1,047,475	1,143,215	1,114,640	1,341,976
Weighted average shares outstanding	28,364,731	12,463,665	26,625,955	12,035,738

Leases (Tables)

6 Months Ended

Jun. 30, 2024

Leases [Abstract]

Schedule of Operating Leases

The following table summarizes the Company’s operating leases as of June 30, 2024:


(In thousands)	U.S.			Ireland			Total
Operating lease cost	20			17			37

Operating cash flows for operating leases	$	(40)		$	(21)		$	(61)
Weighted average remaining lease term	9.6			2.1
Weighted average discount rate - operating leases	8		%	8		%

Schedule of Remaining Maturity of Operating Leases Excluding Short-term Leases

Remaining maturities of the Company’s operating leases, excluding short-term leases, are as follows:


(In thousands)	U.S.		Ireland		Total
Year ended December 31, 2024	$	72	$	21	$	93
Year ended December 31, 2025	144		43		187
Year ended December 31, 2026	144		25		169
Year ended December 31, 2027	148		—		148
Year ended December 31, 2028	153		—		153
Thereafter	800		—		800
Total	1,461		89		1,550
Less present value discount	(451)		(7)		(458)
Operating lease liabilities included in the condensed consolidated balance sheets at June 30, 2024	$	1,010	$	82	$	1,092

Net Loss per Share - Summary of Reconciliation of Weighted Average Shares Outstanding Calculation (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Earnings Per Share [Abstract]
Weighted average shares issued (in shares)	27,317,256	11,320,450	25,511,315	10,693,762
Weighted average pre-funded warrants (in shares)	1,047,475	1,143,215	1,114,640	1,341,976
Weighted average shares outstanding, basic (in shares)	28,364,731	12,463,665	26,625,955	12,035,738
Weighted average shares outstanding, diluted (in shares)	28,364,731	12,463,665	26,625,955	12,035,738

Prepaid Expenses and Other Current Assets (Tables)

6 Months Ended

Jun. 30, 2024

Prepaid Expense and Other Assets, Current [Abstract]

Schedule of Prepaid Expenses and Other Current Assets

Prepaid expenses and other current assets consist of the following:


(In thousands)	June 30, 2024		December 31, 2023
Clinical trial expenses	$	222	$	222
Insurance premiums	145		157
Professional services	657		133
Interest Receivable	23		151
Other	404		428
Total prepaid expenses and other current assets	$	1,451	$	1,091

Revenue - Schedule of Revenue and Accounts Receivable Concentrations (Details) - Single customer - Customer Concentration Risk	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Revenue
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	52.00%	19.00%
Accounts Receivable
Disaggregation of Revenue [Line Items]
Concentration risk, percentage	34.00%	36.80%

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References + Details

Inventory - Schedule of Inventory (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Inventory Disclosure [Abstract]
Raw materials	$ 3,590	$ 1,443
Work-in-process	2,162	1,753
Finished goods	564	126
Total inventory	$ 6,316	$ 3,322

Stockholders' Equity (Tables)

6 Months Ended

Jun. 30, 2024

Stockholders' Equity Note [Abstract]

Schedule of Designated Preferred Units

As of June 30, 2024, the Company has designated the following preferred stock:


Designated Preferred Shares						June 30, 2024
Series A						4,200
Series B						2,360
Series C						590
Series D						10,000
Series E						40,000
Series E-1						12,960
Series F-1						24,900
Series F-2						24,900
Series F-3						34,860
Series F-4						24,900
Total						179,670

Summary of Avenue Warrant Valued Using the Black-Scholes Option Pricing Method

The Company values stock options using the Black-Scholes option pricing model and used the following assumptions, on a weighted-average basis, during the reporting periods:


	Six Months Ended June 30,
	2024	2023
Expected terms (years)	5.5	5.7
Expected volatility	114.3%	161.6%
Risk-free interest rate	4.22%	3.94%
Expected dividends	0.00%	0.00%

Summary of Stock Option Activity

The following is a summary of stock option activity for the six months ended June 30, 2024:


	Number of Options	Weighted Average Exercise Price Per Share		Weighted Average Grant Date Fair Value Per Share		Weighted Average Remaining Contractual Term (in years)	Aggregate Intrinsic Value (in thousands)
Outstanding at January 1, 2024	4,183,232	$	8.17	$	7.60	8.3	$	147
Granted	2,213,096	5.01		4.09		9.5
Exercised	(32,300)	5.22		4.15			60
Expired	(46,956)	8.63		8.34
Cancelled/Forfeited	(184,958)	5.88		5.49
Outstanding at June 30, 2024	6,132,114	$	7.11	$	6.41	8.4	$	12,902

Exercisable at June 30, 2024	2,995,121	$	8.95	$	8.17	7.4	$	3,443
Unvested at June 30, 2024	3,136,993	$	5.36	$	4.73	9.3	$	9,459

Summary of Stock Option Shares Outstanding and Exercisable

The following table summarizes information for stock option shares outstanding and exercisable at June 30, 2024:


		Options Outstanding
Range of Exercise Prices	Outstanding Number of Options	Weighted Average Remaining Option Term (in years)	Number of Options
$2.83 - $51.50	6,131,615	8.4	6,131,615
$51.50+	499	3.8	499
	6,132,114	8.4	6,132,114

Summary of Recognized Share-based Compensation Cost

The following is a summary of share-based compensation expense in the statement of operations:


	Three Months Ended June 30,				Six Months Ended June 30,
(In thousands)	2024		2023		2024		2023
Selling, general and administrative	$	1,930	$	911	$	3,971	$	2,099
Research and development	895		651		1,543		1,068
Cost of goods sold	244		99		500		155
Total	$	3,069	$	1,661	$	6,014	$	3,322

Summary of Warrant Activity

The following is a summary of common stock warrant activity for the six months ended June 30, 2024:


	Warrants	Weighted Average Exercise Price		Weighted Average Remaining Life (in years)
Outstanding at January 1, 2024	4,665,201	$	7.76	1.6
Warrants issued1	1,008,102	0.01
Warrants exercised	(1,308,473)	0.01
Outstanding and exercisable at June 30, 2024	4,364,830			1.1

1All warrants issued in 2024 have been exercised and therefore have no remaining life.

The following is a summary of preferred stock warrant activity for the six months ended June 30, 2024:


	Warrants	Weighted Average Exercise Price		Weighted Average Remaining Life (in years)
Outstanding at January 1, 2024	24,900	$	1,000	2.3
Warrants issued	—
Warrants exercised	(250)	1,000
Outstanding and exercisable at June 30, 2024	24,650	$	1,000	1.8

Schedule of Information Related to Stock Warrants Outstanding and Exercisable

The following table presents information related to common stock warrants outstanding at June 30, 2024:


		Warrants Exercisable
Range of Exercise Prices	Outstanding Number of Warrants	Weighted Average Remaining Warrant Term (in years)	Number of Warrants
$0.01	737,421	3.1	737,421
$6.00	16,666	1.8	16,666
$10.00	3,610,743	0.7	3,610,743
	4,364,830	1.1	4,364,830

- Definition

Tabular disclosure of an entity's stock, including par or stated value per share, number and dollar amount of share subscriptions, shares authorized, shares issued, shares outstanding, number and dollar amount of shares held in an employee trust, dividend per share, total dividends, share conversion features, par value plus additional paid in capital, the value of treasury stock and other information necessary to a fair presentation, and EPS information. Stock by class includes common, convertible, and preferred stocks which are not redeemable or redeemable solely at the option of the issuer. Includes preferred stock with redemption features that are solely within the control of the issuer and mandatorily redeemable stock if redemption is required to occur only upon liquidation or termination of the reporting entity. If more than one issue is outstanding, state the title of each issue and the corresponding dollar amount; dollar amount of any shares subscribed but unissued and the deduction of subscriptions receivable there from; number of shares authorized, issued, and outstanding.

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+ Details

Fair Value Measurements - Schedule of Level 3 Investments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance			$ 6,544
Total change in foreign exchange			(25)
Warrant liability fair value adjustment	$ 9,755	$ (1,160)	10,367	$ (1,160)
Change due to warrant exercise			(106)
Change due to liability payment			(221)
Ending balance	16,559		16,559
Contingent liabilities
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance			996
Total change in foreign exchange			(25)
Warrant liability fair value adjustment			0
Change due to warrant exercise			0
Change due to liability payment			(221)
Ending balance	750		750
Warrants
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance			5,548
Total change in foreign exchange			0
Warrant liability fair value adjustment			10,367
Change due to warrant exercise			(106)
Change due to liability payment			0
Ending balance	$ 15,809		$ 15,809

Loans and Convertible Notes Payable

6 Months Ended

Jun. 30, 2024

Debt Disclosure [Abstract]

Loans and Convertible Notes Payable


	June 30, 2024						December 31, 2023
(In thousands)	Gross		Discount		Net		Gross		Discount		Net
Loans payable, current	$	—	$	—	$	—	$	5,610	$	(371)	$	5,239
Convertible notes payable - current1	4,503		(12)		4,491		5,000		(89)		4,911
Total - Loans and notes payable	$	4,503	$	(12)	$	4,491	$	10,610	$	(460)	$	10,150

1 The gross amount includes the 4.25% final payment of $0.5 million.

Term Loan from Avenue Venture Opportunities Fund, L.P.

On August 6, 2021, the Company entered into a Loan and Security Agreement (the “Avenue Loan Agreement”) with Avenue Venture Opportunities Fund, L.P. (the “Lender,” or “Avenue”) for a term loan in an aggregate principal amount of up to $20.0 million (the “Avenue Loan”). The Avenue Loan bears interest at an annual rate equal to the greater of (a) the sum of 7.70% plus the prime rate as reported in The Wall Street Journal and (b) 10.95%. The interest rate at June 30, 2024 was 16.20%.

The Avenue Loan Agreement requires the Company to make and maintain representations and warranties and other agreements that are customary in loan agreements of this type. The Avenue Loan Agreement also contains customary events of default, including non-payment of principal or interest, violations of covenants, bankruptcy and material judgements. The Avenue Loan is secured by all of the Company’s assets globally, including intellectual property.

The initial tranche of the Avenue Loan was $15.0 million, including $4.0 million that was funded into a restricted account. On March 15, 2023, the Company returned to Avenue $4.0 million held as restricted cash to pay down a portion of the outstanding loan balance, principal payments of $2.1 million and an incremental 4.25% of the final payment of $0.2 million. On March 31, 2023, the Avenue Loan Agreement was amended (the “Avenue Amendment”) to defer the interest only period to September 30, 2023, with an additional extension option upon FDA Approval for the HEPZATO KIT and subsequent receipt of at least $10 million from the sale and issuance of equity securities. On August 14, 2023, the Company received FDA approval and has subsequently received over $10 million from the exercise of Tranche A Preferred Warrants. At the Company’s option, it elected to extend the interest only period to December 31, 2023 and monthly principal payments of approximately $1.0 million began in January 2024 with the final payment occurring on August 1, 2024.

The remaining principal amount of the Avenue Loan outstanding of $2.5 million at June 30, 2024 could be converted, at Avenue’s option, into shares of the Company’s common stock at a conversion price of $11.98 per share.

Avenue did not exercise its option to convert the remaining principal amount of the Avenue Loan into shares of the Company’s common stock and on August 1, 2024, the Company made the final payment due on the Avenue Loan. The Company is anticipating the release from all obligations and Avenue to return all security interests back to the Company.

In connection with the initial entry into the Avenue Loan Agreement, the Company issued warrants to Avenue (the “Initial Avenue Warrant”) to purchase 127,755 shares of common stock at an exercise price per share equal to $0.01. Additionally, in connection with the Avenue Amendment, the Company issued to Avenue a warrant to purchase 34,072 shares of common stock at an exercise price per share equal to $0.01. Avenue exercised all outstanding warrants connected to the Avenue Loan in full in April 2024.

The Company determined that the embedded conversion option associated with the Avenue Loan did not require bifurcation and met the criteria for equity classification. In addition, the amendment was recorded under debt modification guidance. Aggregate debt discount amortization of $0.2 million was recorded during both the three months ended June 30, 2024 and 2023, and $0.4 million for both the six months ended June 30, 2024 and 2023. Interest expense incurred was $0.1 million and $0.3 million for the three months ended June 30, 2024 and 2023, respectively, and $0.4 million and $0.8 million for the six months ended June 30, 2024 and 2023, respectively.

Convertible Notes Payable

The Company has $2.0 million of principal outstanding related to Senior Secured Promissory Notes (the “Rosalind Notes”) which bear interest at 8% per annum. Pursuant to the original terms, the Rosalind Notes were convertible into Series E Preferred Stock at a price of $1,500 per share and were to mature on July 16, 2021.

On August 6, 2021, the Company executed an agreement to amend the Rosalind Notes to (i) reduce the conversion price to $1,198 per share of the Company’s Series E Preferred Stock; and (ii) extend the maturity date to October 30, 2024. In addition, the holders of the Rosalind Notes agreed to subordinate all of the Company’s indebtedness and obligations to Avenue and all of the holders’ security interest to the Avenue Loan and Avenue’s security interest in the Company’s property.

Interest expense accrued relating to the Rosalind Notes was less than $0.1 million for both the three and six months ended June 30, 2024 and 2023.

- Definition

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
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-Publisher FASB
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+ Details

Stockholders' Equity - Authorized Shares and Preferred Stock (Details) - $ / shares	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022
Stockholders Equity Note [Line Items]
Common stock, shares authorized (in shares)	80,000,000		80,000,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01	$ 0.01	$ 0.01	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	10,000,000		10,000,000
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01	$ 0.01	$ 0.01	$ 0.01	$ 0.01
Preferred stock, shares outstanding (in shares)	12,342		24,819
Series E
Stockholders Equity Note [Line Items]
Preferred stock, shares outstanding (in shares)	11,257
Series E-1
Stockholders Equity Note [Line Items]
Preferred stock, shares outstanding (in shares)	11,257
Series F-2
Stockholders Equity Note [Line Items]
Preferred stock, par value (in dollars per share)	$ 3.30
Preferred stock, shares outstanding (in shares)	1,085
Series F-3
Stockholders Equity Note [Line Items]
Preferred stock, par value (in dollars per share)	$ 4.50
Preferred stock, shares outstanding (in shares)	0
Series F-4
Stockholders Equity Note [Line Items]
Preferred stock, par value (in dollars per share)	$ 6.00
Preferred stock, shares outstanding (in shares)	0

General (Policies)	6 Months Ended
General (Policies)	Jun. 30, 2024
Accounting Policies [Abstract]
Risks and Uncertainties	Risks and Uncertainties As detailed in the Company’s 2023 Annual Report filed on Form 10-K, the Company is subject to risks common to companies in the biopharmaceutical industry with FDA-approved products and planned clinical development activities, including, but not limited to, risks associated with successfully launching and commercializing the products; further developing HEPZATO to potentially treat other cancers in the liver and the Company’s ability to obtain any additional regulatory approval of such products in the United States and obtaining regulatory approval in other geographic markets; the uncertainty relating to the broad adoption of any approved products by physicians and consumers; and the impacts of significant competition. In addition, high rates of inflation have previously resulted in the U.S. Federal Reserve raising interest rates and any future increases in interest rates, especially if coupled with reduced government spending and volatility in financial markets, may further increase economic uncertainty and heighten these risks. Furthermore, if additional banks and financial institutions enter receivership or become insolvent in the future in response to financial conditions affecting the banking system and financial markets, the Company or its partners’ ability to access existing cash, cash equivalents and investments may be threatened and could have a material adverse effect on the Company’s business and financial condition, including the Company’s ability to access additional capital on favorable terms, or at all, which could in the future negatively affect the Company’s ability to pursue its business strategy.
Liquidity and Going Concern	Liquidity and Going Concern On June 30, 2024, the Company had cash and cash equivalents totaling $14.8 million and short-term investments totaling $5.1 million, as compared to cash, cash equivalents and restricted cash totaling $12.7 million and short-term investments totaling $19.8 million at December 31, 2023. During the six months ended June 30, 2024, the Company used $14.0 million of cash in its operating activities and $6.1 million for principal payments. The Company’s future results are subject to substantial risks and uncertainties. The Company has operated at a loss for its entire history and there can be no assurance that it will ever achieve or maintain profitability. The Company has historically funded its operations primarily with proceeds from sales of common stock, warrants and pre-funded warrants for the purchase of common stock, sales of preferred stock, proceeds from the issuance of convertible debt and borrowings under loan and security agreements. If there is a substantial delay in the activation of additional sites to administer HEPZATO and/or the revenue generated from HEPZATO and CHEMOSAT is less than anticipated, the Company expects to need to raise additional capital under structures available to the Company, including debt and/or equity offerings, which may not be on favorable terms. In a substantially delayed site activation scenario, the Company would not have sufficient funds to meet its obligations within twelve months from the issuance date of these condensed consolidated financial statements. As such, there is uncertainty regarding the Company’s ability to maintain liquidity sufficient to operate its business effectively, which raises substantial doubt about the Company’s ability to continue as a going concern. Debt financing and equity financing, if available, may involve agreements that include covenants limiting or restricting the Company’s ability to take specific actions, such as incurring additional debt, making capital expenditures or declaring dividends. If the Company raises funds through collaborations or other similar arrangements with third parties, it may have to relinquish valuable rights to its technologies, future revenue streams, research programs for product candidates and/or grant licenses on terms that may not be favorable to the Company, any of which may reduce the value of its common stock. If the Company is unable to raise additional funds through equity or debt financings when needed, it may be required to delay, limit, reduce or terminate its product development or future commercialization efforts or grant rights to develop and market its product candidates to third parties even if the Company would otherwise prefer to develop and market such product candidates itself. The Company expects to use cash and cash equivalents to fund activities relating to commercial support for HEPZATO, CHEMOSAT and any future clinical research trials and operating activities. The Company’s future liquidity and capital requirements will depend on numerous factors, including the initiation and progress of clinical trials and research and product development programs; obtaining regulatory approvals and complying with applicable laws and regulations; the timing and effectiveness of product commercialization activities, including marketing arrangements; the timing and costs involved in preparing, filing, prosecuting, defending and enforcing intellectual property rights; the resolution of any disputes with third parties; and the effect of competing technological and market developments. The Company’s capital commitments over the next twelve months include (a) $7.8 million to satisfy accounts payable, accrued expenses, current lease liabilities and current medac settlement and (b) $4.5 million of loan and convertible note principal payments, if the holders do not elect to convert the notes into equity. Additional capital commitments beyond the next twelve months include (a) $1.4 million of lease liabilities; and (b) $0.6 million for settlement of litigation with medac.
Basis of Presentation	Basis of Presentation These interim condensed consolidated financial statements are unaudited and were prepared by the Company in accordance with generally accepted accounting principles in the United States of America (GAAP) and with the SEC’s instructions to Form 10-Q and Article 10 of Regulation S-X. They include the accounts of all wholly owned subsidiaries and all significant inter-company accounts and transactions have been eliminated in consolidation. The preparation of interim condensed consolidated financial statements requires management to make assumptions and estimates that impact the amounts reported. These interim condensed consolidated financial statements reflect all adjustments, consisting of normal recurring accruals, necessary for a fair presentation of the Company’s results of operations, financial position and cash flows for the interim periods ended June 30, 2024 and 2023; however, certain information and footnote disclosures normally included in our audited consolidated financial statements which were included in our Annual Report have been condensed or omitted as permitted by GAAP. It is important to note that the Company’s results of operations and cash flows for interim periods are not necessarily indicative of the results of operations and cash flows to be expected for a full fiscal year or any interim period.
Recent Accounting Pronouncements	Recent Accounting Pronouncements No new accounting standards were adopted during the six months ended June 30, 2024.

Accrued Expenses (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Payables and Accruals [Abstract]
Clinical expenses	$ 419	$ 1,129
Compensation, excluding taxes	2,302	1,859
Professional fees	165	272
Interest on convertible note	793	713
Inventory	8	585
Other	731	691
Total accrued expenses	$ 4,418	$ 5,249

Fair Value Measurements - Schedule of Fair Value Assumptions for Warrants (Details) - Preferred and Common Warrants - Valuation Technique, Option Pricing Model	Jun. 30, 2024	Dec. 31, 2023
Risk free interest rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrants measurement input	0.0469	0.0409
Expected term (years)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrants measurement input	1.8	2.3
Expected volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrants measurement input	0.60	0.70
Expected dividends
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrants measurement input	0.0000	0.0000

Revenue (Tables)

6 Months Ended

Jun. 30, 2024

Revenue from Contract with Customer [Abstract]

Schedule of Revenue by Product

Revenue by product for the periods indicated were as follows:


	Three Months Ended June 30,				Six Months Ended June 30,
(In thousands)	2024		2023		2024		2023
CHEMOSAT	$	1,196	$	495	$	2,327	$	1,092
HEPZATO KIT	6,570		—		8,578		—
Total revenue	$	7,766	$	495	$	10,905	$	1,092

Schedule of Revenue and Accounts Receivable Concentrations

The Company’s total percentage of revenue and accounts receivable concentrations from a single customer consisted of the following:


For the six months ended and as of	Revenue		Accounts Receivable
June 30, 2024	52.0	%	34.0	%
June 30, 2023	19.0	%	36.8	%

Stockholders' Equity - Designated Preferred Shares (Details)	Jun. 30, 2024 shares
Class of Stock [Line Items]
Preferred stock, shares designated (in shares)	179,670
Series A
Class of Stock [Line Items]
Preferred stock, shares designated (in shares)	4,200
Series B
Class of Stock [Line Items]
Preferred stock, shares designated (in shares)	2,360
Series C
Class of Stock [Line Items]
Preferred stock, shares designated (in shares)	590
Series D
Class of Stock [Line Items]
Preferred stock, shares designated (in shares)	10,000
Series E
Class of Stock [Line Items]
Preferred stock, shares designated (in shares)	40,000
Series E-1
Class of Stock [Line Items]
Preferred stock, shares designated (in shares)	12,960
Series F-1
Class of Stock [Line Items]
Preferred stock, shares designated (in shares)	24,900
Series F-2
Class of Stock [Line Items]
Preferred stock, shares designated (in shares)	24,900
Series F-3
Class of Stock [Line Items]
Preferred stock, shares designated (in shares)	34,860
Series F-4
Class of Stock [Line Items]
Preferred stock, shares designated (in shares)	24,900

Investments (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value	$ 5,124	$ 19,808
Interest receivable	23	151
U.S. government agency bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	5,100	19,651
Gross Unrealized, Gains	24	157
Estimated Fair Value	$ 5,124	$ 19,808

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
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-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
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-Section 50
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-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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-Paragraph 2
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
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Reference 10: http://www.xbrl.org/2003/role/disclosureRef
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Reference 11: http://www.xbrl.org/2003/role/disclosureRef
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Reference 12: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

Property, Plant, and Equipment

6 Months Ended

Jun. 30, 2024

Property, Plant and Equipment [Abstract]

Property, Plant, and Equipment

Property, plant, and equipment consist of the following:


(In thousands)	June 30, 2024		December 31, 2023		Estimated Useful Life
Buildings and land	$	1,318	$	1,318	30 years - Buildings
Enterprise hardware and software	1,855		1,857		3 years
Leaseholds	1,776		1,787		Lesser of lease term or estimated useful life
Equipment	1,348		1,263		7 years
Furniture	238		202		5 years
Construction in process	10		—
Property, plant and equipment, gross	6,545		6,427
Accumulated depreciation	(5,123)		(5,075)
Property, plant and equipment, net	$	1,422	$	1,352

Depreciation expense for the three and six months ended June 30, 2024 and 2023 was less than $0.1 million for each period.

Revenue - Schedule of Revenue by Product (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Disaggregation of Revenue [Line Items]
Total revenue	$ 7,766	$ 495	$ 10,905	$ 1,092
CHEMOSAT
Disaggregation of Revenue [Line Items]
Total revenue	1,196	495	2,327	1,092
HEPZATO KIT
Disaggregation of Revenue [Line Items]
Total revenue	$ 6,570	$ 0	$ 8,578	$ 0

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References + Details

- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 41
-Subparagraph (a)
-Publisher FASB
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
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Reference 10: http://www.xbrl.org/2003/role/disclosureRef
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Reference 12: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org/1943274/2147479806/606-10-50-4

+ Details

Fair Value Measurements - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Fair Value Disclosures [Abstract]
Other expense related to the change in fair value of the warrant liability	$ 9,755	$ (1,160)	$ 10,367	$ (1,160)

General (Details) - USD ($) $ in Thousands	6 Months Ended
General (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Organization Consolidation Basis Of Presentation Business Description And Accounting Policies [Line Items]
Cash cash equivalents and restricted cash	$ 14,800		$ 12,700
Short-term investments	5,124		$ 19,808
Net cash used in operating activities	14,035	$ 13,912
Principal payments	6,107	$ 6,313
Accounts payable, accrued expenses, current lease liabilities and current medac settlement
Organization Consolidation Basis Of Presentation Business Description And Accounting Policies [Line Items]
Current capital commitments	7,800
Loan and convertible note principal payments
Organization Consolidation Basis Of Presentation Business Description And Accounting Policies [Line Items]
Current capital commitments	4,500
Lease liabilities
Organization Consolidation Basis Of Presentation Business Description And Accounting Policies [Line Items]
Noncurrent capital commitments	1,400
Settlement of litigation with medac
Organization Consolidation Basis Of Presentation Business Description And Accounting Policies [Line Items]
Noncurrent capital commitments	$ 600

Leases - Schedule of Remaining Maturity of Operating Leases Excluding Short-term Leases (Details) $ in Thousands	Jun. 30, 2024 USD ($)
Lessee Lease Description [Line Items]
Year ended December 31, 2024	$ 93
Year ended December 31, 2025	187
Year ended December 31, 2026	169
Year ended December 31, 2027	148
Year ended December 31, 2028	153
Thereafter	800
Total	1,550
Less present value discount	(458)
Operating lease liabilities included in the condensed consolidated balance sheets at June 30, 2024	1,092
U.S.
Lessee Lease Description [Line Items]
Year ended December 31, 2024	72
Year ended December 31, 2025	144
Year ended December 31, 2026	144
Year ended December 31, 2027	148
Year ended December 31, 2028	153
Thereafter	800
Total	1,461
Less present value discount	(451)
Operating lease liabilities included in the condensed consolidated balance sheets at June 30, 2024	1,010
Ireland
Lessee Lease Description [Line Items]
Year ended December 31, 2024	21
Year ended December 31, 2025	43
Year ended December 31, 2026	25
Year ended December 31, 2027	0
Year ended December 31, 2028	0
Thereafter	0
Total	89
Less present value discount	(7)
Operating lease liabilities included in the condensed consolidated balance sheets at June 30, 2024	$ 82

Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Jun. 30, 2024	Dec. 31, 2023
Statement of Financial Position [Abstract]
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	10,000,000	10,000,000
Preferred stock, shares issued (in shares)	12,342	24,819
Preferred stock, shares outstanding (in shares)	12,342	24,819
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	80,000,000	80,000,000
Common stock, shares issued (in shares)	27,931,393	22,761,554
Common stock, shares outstanding (in shares)	27,931,393	22,761,554

Condensed Consolidated Statements of Stockholders' Equity (Deficit) (Parenthetical) - $ / shares	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022
Statement of Stockholders' Equity [Abstract]
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01	$ 0.01	$ 0.01	$ 0.01	$ 0.01
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01	$ 0.01	$ 0.01	$ 0.01	$ 0.01

Inventory

6 Months Ended

Jun. 30, 2024

Inventory Disclosure [Abstract]

Inventory

Inventory consists of the following:


(In thousands)	June 30, 2024		December 31, 2023
Raw materials	$	3,590	$	1,443
Work-in-process	2,162		1,753
Finished goods	564		126
Total inventory	$	6,316	$	3,322

The Company has consignment agreements with approved hospitals and treatment centers. As of June 30, 2024, there was $0.3 million in finished goods held at hospitals and treatment centers.

Investments (Tables)

6 Months Ended

Jun. 30, 2024

Investments, Debt and Equity Securities [Abstract]

Schedule of Unrealized Gains

The following table summarizes the gross unrealized gains on the Company’s marketable securities as of June 30, 2024:


	June 30, 2024
			Gross Unrealized
(In thousands)	Amortized Cost		Gains		Estimated Fair Value
U.S. government agency bonds	$	5,100	$	24	$	5,124
Short-term investments					$	5,124

The following table summarizes the gross unrealized gains on the Company’s marketable securities as of December 31, 2023:


	December 31, 2023
			Gross Unrealized
(in thousands)	Amortized Cost		Gains		Estimated Fair Value
U.S. government agency bonds	$	19,651	$	157	$	19,808
Short-term investments					$	19,808

- Definition

Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-9

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
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-URI https://asc.fasb.org/1943274/2147481800/320-10-50-3

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 10: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 12: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-3

+ Details

Net Loss per Share (Tables)

6 Months Ended

Jun. 30, 2024

Earnings Per Share [Abstract]

Schedule of Potentially Dilutive Securities Excluded from the Computation of Earnings Per Share

The following potentially dilutive securities were excluded from the computation of earnings per share as of June 30, 2024 and 2023 because their effects would be anti-dilutive:


	June 30,
	2024	2023
Common stock warrants	3,627,409	3,658,520
Assumed conversion of preferred stock warrants	4,108,328	11,896,667
Assumed conversion of preferred stock	1,454,509	4,051,637
Assumed conversion of convertible notes	446,563	488,031
Stock options	6,132,114	4,127,932
Total	15,768,923	24,222,787

Summary of Reconciliation of Weighted Average Shares Outstanding Calculation

The following table provides a reconciliation of the weighted average shares outstanding calculation for the three and six months ended June 30, 2024 and 2023:


	Three months ended June 30,		Six months ended June 30,
	2024	2023	2024	2023
Weighted average shares issued	27,317,256	11,320,450	25,511,315	10,693,762
Weighted average pre-funded warrants	1,047,475	1,143,215	1,114,640	1,341,976
Weighted average shares outstanding	28,364,731	12,463,665	26,625,955	12,035,738

Property, Plant, and Equipment - Schedule of Property, Plant, and Equipment (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 6,545	$ 6,427
Accumulated depreciation	(5,123)	(5,075)
Property, plant and equipment, net	1,422	1,352
Buildings and land
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 1,318	1,318
Buildings
Property Plant And Equipment [Line Items]
Estimated Useful Life	30 years
Enterprise hardware and software
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 1,855	1,857
Estimated Useful Life	3 years
Leaseholds
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 1,776	1,787
Equipment
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 1,348	1,263
Estimated Useful Life	7 years
Furniture
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 238	202
Estimated Useful Life	5 years
Construction in process
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 10	$ 0

Leases

6 Months Ended

Jun. 30, 2024

Leases [Abstract]

Leases

The Company recognizes right-of-use (“ROU”) assets and lease liabilities when it obtains the right to control an asset under a leasing arrangement with an initial term greater than twelve months. The Company leases its facilities under non-cancellable operating leases. The Company evaluates the nature of each lease at the inception of an arrangement to determine whether it is an operating or financing lease and recognizes the ROU asset and lease liabilities based on the present value of future minimum lease payments over the expected lease term. The Company’s leases do not generally contain an implicit interest rate and therefore the Company uses the incremental borrowing rate it would expect to pay to borrow on a similar collateralized basis over a similar term in order to determine the present value of its lease payments.

For both the three months ended June 30, 2024 and 2023, the Company recognized less than $0.1 million of operating lease expense, and $0.1 million and $0.2 million for the six months ended June 30, 2024 and 2023, respectively.

In 2021, the Company entered into a sub-lease agreement (the “2021 Sub-Lease”) with its previous sub-lessee pursuant to which, effective August 2, 2021, the previous sub-lessee would become the lessee and the Company would then sublease its portion of the premises in Galway, Ireland from the previous sub-lessee. The Company’s annual rent expense under the 2021 Sub-Lease is less than $0.1 million for a term of 5 years.

In 2020, the Company entered into an amendment to a sub-lease agreement executed in 2016 for office space at 1633 Broadway, New York, New York. The term of the sub-lease agreement began in April 2016 and, pursuant to amendments, was extended through August 2023. As of August 31, 2023, the lease was month-to-month. No ROU assets or lease liabilities were recognized on the balance sheet as of December 31, 2023 for this arrangement. The Company ended the sublease for its former corporate offices at 1633 Broadway, New York, New York in February 2024.

On January 18, 2024, the Company entered into a lease agreement (the “Queensbury Lease”) to lease approximately 18,000 square feet of manufacturing and office space in Queensbury, New York (the “Premises”). The initial term of the lease is five years with a right to extend the lease by an additional five years, exercisable under certain conditions set forth in the Queensbury Lease. The Company’s annual rent expense under the Queensbury Lease is less than $0.2 million for a term of 5 years.

The following table summarizes the Company’s operating leases as of June 30, 2024:


(In thousands)	U.S.			Ireland			Total
Operating lease cost	20			17			37

Operating cash flows for operating leases	$	(40)		$	(21)		$	(61)
Weighted average remaining lease term	9.6			2.1
Weighted average discount rate - operating leases	8		%	8		%

Remaining maturities of the Company’s operating leases, excluding short-term leases, are as follows:


(In thousands)	U.S.		Ireland		Total
Year ended December 31, 2024	$	72	$	21	$	93
Year ended December 31, 2025	144		43		187
Year ended December 31, 2026	144		25		169
Year ended December 31, 2027	148		—		148
Year ended December 31, 2028	153		—		153
Thereafter	800		—		800
Total	1,461		89		1,550
Less present value discount	(451)		(7)		(458)
Operating lease liabilities included in the condensed consolidated balance sheets at June 30, 2024	$	1,010	$	82	$	1,092

Leases

The following table summarizes the Company’s operating leases as of June 30, 2024:


(In thousands)	U.S.			Ireland			Total
Operating lease cost	20			17			37

Operating cash flows for operating leases	$	(40)		$	(21)		$	(61)
Weighted average remaining lease term	9.6			2.1
Weighted average discount rate - operating leases	8		%	8		%

Remaining maturities of the Company’s operating leases, excluding short-term leases, are as follows:


(In thousands)	U.S.		Ireland		Total
Year ended December 31, 2024	$	72	$	21	$	93
Year ended December 31, 2025	144		43		187
Year ended December 31, 2026	144		25		169
Year ended December 31, 2027	148		—		148
Year ended December 31, 2028	153		—		153
Thereafter	800		—		800
Total	1,461		89		1,550
Less present value discount	(451)		(7)		(458)
Operating lease liabilities included in the condensed consolidated balance sheets at June 30, 2024	$	1,010	$	82	$	1,092

Stockholders' Equity - Equity Incentive Plan (Details) - shares	May 23, 2024	Jun. 30, 2024
2020 Plan
Class of Warrant or Right [Line Items]
Common stock, capital shares reserved (in shares)		7,125,000
Increase in shares available under equity incentive plan (in shares)	2,000,000
Number of shares available for grant (in shares)		2,140,327
2023 Plan
Class of Warrant or Right [Line Items]
Common stock, capital shares reserved (in shares)		650,000
Number of shares available for grant (in shares)		339,000

Commitments and Contingencies	6 Months Ended
Commitments and Contingencies	Jun. 30, 2024
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies medac Matter In April 2021, the Company’s wholly owned subsidiary, Delcath Systems Ltd, issued to medac GmbH, a privately held, multi-national pharmaceutical company based in Germany (“medac”), an invoice for a €1 million milestone payment under a License, Supply and Marketing Agreement dated December 10, 2018 (the “medac Agreement”) between medac and the Company. The medac Agreement provided to medac the exclusive right to market and sell CHEMOSAT in certain designated countries for which the Company was entitled to a combination of upfront and success-based milestone payments as well as a fixed transfer price per unit of CHEMOSAT and specified royalties. In response to medac’s subsequent dispute and non-payment of the invoice, on October 12, 2021, the Company notified medac in writing that it was terminating the medac Agreement due to medac’s nonpayment of the €1 million milestone payment, with the effective date of termination of the medac Agreement being April 12, 2022. On December 16, 2021, the Company initiated an arbitration proceeding pursuant to the dispute resolution procedures of the medac Agreement for the non-payment of the invoice. On December 30, 2022, the parties reached a final settlement of the matter and the Company agreed to pay medac either (a) a royalty on sales of CHEMOSAT units over a defined minimum for a period of five years or until a maximum payment has been reached, or (b) a minimum annual payment of $0.2 million in the event the annual royalty payment does not reach the agreed minimum payment amount. The first annual payment was made in May 2024 and the Company has estimated the remaining fair value of the settlement to be $0.8 million as of June 30, 2024 and recorded $0.6 million as other liabilities, non-current and $0.2 million as accrued expenses on the Company’s condensed consolidated balance sheet as of June 30, 2024. Manufacturing and Supply Agreements The Company has a License, Supply and Contract Manufacturing Agreement (as amended, the “Supply Agreement”) with Synerx Pharma, LLC and Mylan Teoranta for the supply of melphalan provided in the HEPZATO KIT. An amendment to the Supply Agreement was entered into on April 22, 2024, and effective as of May 1, 2024, which extends the term of the agreement through December 31, 2028, with an option to renew for successive five-year periods upon the mutual written consent of both parties. Although the Supply Agreement does not contain an annual minimum purchase quantity, the Agreement requires Delcath to order full lots of labeled melphalan vials. As of June 30, 2024, the Company has committed to purchase $2.4 million of melphalan under this Supply Agreement in 2024.

Stockholders' Equity - Common Purchase Agreement (Details) - USD ($) $ in Millions	Aug. 14, 2023	Mar. 29, 2023	Mar. 27, 2023	Jun. 30, 2024
Stockholders Equity Note [Line Items]
Deferred revenue		$ 10.0		$ 10.0
Tranche A Warrants \| Common Purchase Agreement
Stockholders Equity Note [Line Items]
Number of exercisable common warrants (in shares)	31,110		31,110
Aggregate exercise price of preferred warrants		$ 0.1
Tranche B Warrants \| Common Purchase Agreement
Stockholders Equity Note [Line Items]
Number of exercisable common warrants (in shares)		16,666	16,666
Aggregate exercise price of preferred warrants		$ 0.1
Warrants exercisable, period		21 days

Loans and Convertible Notes Payable (Tables)

6 Months Ended

Jun. 30, 2024

Debt Disclosure [Abstract]

Summary of Loans and Convertible Notes Payable


	June 30, 2024						December 31, 2023
(In thousands)	Gross		Discount		Net		Gross		Discount		Net
Loans payable, current	$	—	$	—	$	—	$	5,610	$	(371)	$	5,239
Convertible notes payable - current1	4,503		(12)		4,491		5,000		(89)		4,911
Total - Loans and notes payable	$	4,503	$	(12)	$	4,491	$	10,610	$	(460)	$	10,150

1 The gross amount includes the 4.25% final payment of $0.5 million.

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
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-Topic 210
-Publisher FASB
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Reference 2: http://www.xbrl.org/2003/role/exampleRef
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-Name Accounting Standards Codification
-Section 55
-Paragraph 69B
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Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Topic 470
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-Section 55
-Paragraph 69E
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481568/470-20-55-69E

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
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-SubTopic 10
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-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-04(a))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-3

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
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-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482925/835-30-45-2

Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 505
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-Section 50
-Paragraph 3
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Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 505
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-Section 50
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Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-7

+ Details

Property, Plant, and Equipment - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Property, Plant and Equipment [Abstract]
Depreciation expense	$ 100	$ 100	$ 62	$ 59

Accrued Expenses (Tables)

6 Months Ended

Jun. 30, 2024

Payables and Accruals [Abstract]

Schedule of Accrued Expenses

Accrued expenses consist of the following:


(In thousands)	June 30, 2024		December 31, 2023
Clinical expenses	$	419	$	1,129
Compensation, excluding taxes	2,302		1,859
Professional fees	165		272
Interest on convertible note	793		713
Inventory	8		585
Other	731		691
Total accrued expenses	$	4,418	$	5,249

General	6 Months Ended
General	Jun. 30, 2024
Accounting Policies [Abstract]
General	General The unaudited interim condensed consolidated financial statements of Delcath Systems, Inc. (“Delcath” or the “Company”) as of and for the three and six months ended June 30, 2024 and 2023 should be read in conjunction with the audited consolidated financial statements and notes thereto included in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2023 (the “Annual Report”), which was filed with the Securities and Exchange Commission (the “SEC”) on March 26, 2024 and may also be found on the Company’s website (www.delcath.com). In these notes to the interim condensed consolidated financial statements the terms “us”, “we” or “our” refer to Delcath and its consolidated subsidiaries. Description of Business The Company is an interventional oncology company focused on the treatment of cancers primary or metastatic to the liver. The Company’s lead product, the HEPZATOTM KIT (melphalan for Injection/Hepatic Delivery System), a drug/device combination product, was approved by the US Food and Drug Administration (the “FDA”) on August 14, 2023, indicated as a liver-directed treatment for adult patients with uveal melanoma with unresectable hepatic metastases affecting less than 50% of the liver and no extrahepatic disease, or extrahepatic disease limited to the bone, lymph nodes, subcutaneous tissues, or lung that is amenable to resection, or radiation. The first commercial use of HEPZATO KIT (“HEPZATO”) for the treatment of metastatic uveal melanoma (“mUM”) occurred in January 2024. In the United States, HEPZATO is considered a combination drug and device product and is regulated as a drug by the FDA. Primary jurisdiction for regulation of HEPZATO has been assigned to the FDA’s Center for Drug Evaluation and Research. The FDA has granted Delcath six orphan drug designations (five for melphalan in the treatment of patients with ocular (uveal) melanoma, cutaneous melanoma, intrahepatic cholangiocarcinoma, hepatocellular carcinoma, and neuroendocrine tumor indications and one for doxorubicin in the treatment of patients with hepatocellular carcinoma). The Company has sufficient raw material and component constituent parts of HEPZATO KIT to meet anticipated demand and it intends to manage supply chain risk through stockpiled inventory and, where commercially reasonable, contracting with multiple suppliers for critical components. In Europe, the hepatic delivery system is a stand-alone medical device having the same device components as HEPZATO, but without the melphalan hydrochloride and is approved for sale under the trade name CHEMOSAT Hepatic Delivery System for Melphalan (“CHEMOSAT”), where it has been used at major medical centers to treat a wide range of cancers in the liver. On February 28, 2022, CHEMOSAT received Medical Device Regulation (MDR) certification under the European Medical Devices Regulation (EU) 2017/745, which may be considered by jurisdictions when evaluating reimbursement. To support the New Drug Application for HEPZATO the Company conducted the FOCUS Clinical Trial for Patients with metastatic hepatic dominant Uveal Melanoma (the “FOCUS Trial”), a global registration clinical trial that investigated objective response rate in patients with mUM. On May 6, 2024, the Company announced the publication of results from the pivotal FOCUS Trial in the journal Annals of Surgical Oncology. The current focus of the Company’s clinical development program is to generate clinical data for CHEMOSAT and HEPZATO either as monotherapy or in combination with immunotherapy. The Company expects that this will support increased clinical adoption of and reimbursement for CHEMOSAT in Europe, and to support reimbursement in various jurisdictions, including the United States. In addition to HEPZATO’s use to treat mUM, the Company believes that HEPZATO has the potential to treat other cancers in the liver, such as metastatic colorectal cancer, metastatic neuroendocrine tumors, metastatic breast cancer and intrahepatic cholangiocarcinoma, and plans to begin one or more studies of HEPZATO KIT to treat such conditions in late 2024 or early 2025. The Company believes that those and similar disease states are areas of unmet medical needs that represent significant market opportunities. Risks and Uncertainties As detailed in the Company’s 2023 Annual Report filed on Form 10-K, the Company is subject to risks common to companies in the biopharmaceutical industry with FDA-approved products and planned clinical development activities, including, but not limited to, risks associated with successfully launching and commercializing the products; further developing HEPZATO to potentially treat other cancers in the liver and the Company’s ability to obtain any additional regulatory approval of such products in the United States and obtaining regulatory approval in other geographic markets; the uncertainty relating to the broad adoption of any approved products by physicians and consumers; and the impacts of significant competition. In addition, high rates of inflation have previously resulted in the U.S. Federal Reserve raising interest rates and any future increases in interest rates, especially if coupled with reduced government spending and volatility in financial markets, may further increase economic uncertainty and heighten these risks. Furthermore, if additional banks and financial institutions enter receivership or become insolvent in the future in response to financial conditions affecting the banking system and financial markets, the Company or its partners’ ability to access existing cash, cash equivalents and investments may be threatened and could have a material adverse effect on the Company’s business and financial condition, including the Company’s ability to access additional capital on favorable terms, or at all, which could in the future negatively affect the Company’s ability to pursue its business strategy. Liquidity and Going Concern On June 30, 2024, the Company had cash and cash equivalents totaling $14.8 million and short-term investments totaling $5.1 million, as compared to cash, cash equivalents and restricted cash totaling $12.7 million and short-term investments totaling $19.8 million at December 31, 2023. During the six months ended June 30, 2024, the Company used $14.0 million of cash in its operating activities and $6.1 million for principal payments. The Company’s future results are subject to substantial risks and uncertainties. The Company has operated at a loss for its entire history and there can be no assurance that it will ever achieve or maintain profitability. The Company has historically funded its operations primarily with proceeds from sales of common stock, warrants and pre-funded warrants for the purchase of common stock, sales of preferred stock, proceeds from the issuance of convertible debt and borrowings under loan and security agreements. If there is a substantial delay in the activation of additional sites to administer HEPZATO and/or the revenue generated from HEPZATO and CHEMOSAT is less than anticipated, the Company expects to need to raise additional capital under structures available to the Company, including debt and/or equity offerings, which may not be on favorable terms. In a substantially delayed site activation scenario, the Company would not have sufficient funds to meet its obligations within twelve months from the issuance date of these condensed consolidated financial statements. As such, there is uncertainty regarding the Company’s ability to maintain liquidity sufficient to operate its business effectively, which raises substantial doubt about the Company’s ability to continue as a going concern. Debt financing and equity financing, if available, may involve agreements that include covenants limiting or restricting the Company’s ability to take specific actions, such as incurring additional debt, making capital expenditures or declaring dividends. If the Company raises funds through collaborations or other similar arrangements with third parties, it may have to relinquish valuable rights to its technologies, future revenue streams, research programs for product candidates and/or grant licenses on terms that may not be favorable to the Company, any of which may reduce the value of its common stock. If the Company is unable to raise additional funds through equity or debt financings when needed, it may be required to delay, limit, reduce or terminate its product development or future commercialization efforts or grant rights to develop and market its product candidates to third parties even if the Company would otherwise prefer to develop and market such product candidates itself. The Company expects to use cash and cash equivalents to fund activities relating to commercial support for HEPZATO, CHEMOSAT and any future clinical research trials and operating activities. The Company’s future liquidity and capital requirements will depend on numerous factors, including the initiation and progress of clinical trials and research and product development programs; obtaining regulatory approvals and complying with applicable laws and regulations; the timing and effectiveness of product commercialization activities, including marketing arrangements; the timing and costs involved in preparing, filing, prosecuting, defending and enforcing intellectual property rights; the resolution of any disputes with third parties; and the effect of competing technological and market developments. The Company’s capital commitments over the next twelve months include (a) $7.8 million to satisfy accounts payable, accrued expenses, current lease liabilities and current medac settlement and (b) $4.5 million of loan and convertible note principal payments, if the holders do not elect to convert the notes into equity. Additional capital commitments beyond the next twelve months include (a) $1.4 million of lease liabilities; and (b) $0.6 million for settlement of litigation with medac. Basis of Presentation These interim condensed consolidated financial statements are unaudited and were prepared by the Company in accordance with generally accepted accounting principles in the United States of America (GAAP) and with the SEC’s instructions to Form 10-Q and Article 10 of Regulation S-X. They include the accounts of all wholly owned subsidiaries and all significant inter-company accounts and transactions have been eliminated in consolidation. The preparation of interim condensed consolidated financial statements requires management to make assumptions and estimates that impact the amounts reported. These interim condensed consolidated financial statements reflect all adjustments, consisting of normal recurring accruals, necessary for a fair presentation of the Company’s results of operations, financial position and cash flows for the interim periods ended June 30, 2024 and 2023; however, certain information and footnote disclosures normally included in our audited consolidated financial statements which were included in our Annual Report have been condensed or omitted as permitted by GAAP. It is important to note that the Company’s results of operations and cash flows for interim periods are not necessarily indicative of the results of operations and cash flows to be expected for a full fiscal year or any interim period. Significant Accounting Policies There have been no material changes to our significant accounting policies as set forth in Note 3 Summary of Significant Accounting Policies to the consolidated financial statements included in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2023. Recent Accounting Pronouncements No new accounting standards were adopted during the six months ended June 30, 2024.

Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2024

Fair Value Disclosures [Abstract]

Schedule of Level 3 Investments

The table below presents activity within Level 3 of the fair value hierarchy, our liabilities carried at fair value for the six months ended June 30, 2024:


	Level 3
(In thousands)	Contingent liabilities		Warrants		Total
Balance at January 1, 2024	$	996	$	5,548	$	6,544
Total change in foreign exchange	(25)		—		(25)
Warrant liability fair value adjustment	—		10,367		10,367
Change due to warrant exercise	—		(106)		(106)
Change due to liability payment	(221)		—		(221)
Balance at June 30, 2024	$	750	$	15,809	$	16,559

Schedule of Fair Value Assumptions for Warrants

The fair value of the preferred and common warrants at June 30, 2024 and December 31, 2023 was determined by using option pricing models assuming the following:


	June 30, 2024	December 31, 2023
Risk free interest rate	4.69%	4.09%
Expected term (years)	1.8	2.3
Expected volatility	60%	70%
Expected dividends	0.00%	0.00%

Schedule of Financial Assets and Liabilities Measured at Fair Value


	June 30, 2024
(In thousands)	Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
Assets:
Money market funds	$	5,466	$	—	$	—	$	5,466
U.S. government agency bonds	—		5,124		—		5,124
Total Assets	$	5,466	$	5,124	$	—	$	10,590

Liabilities:
Contingent Liability	$	—	$	—	$	750	$	750
Warrant Liabilities	—		—		15,809		15,809
Total Liabilities	$	—	$	—	$	16,559	$	16,559


	December 31, 2023
(In thousands)	Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
Assets:
Money market funds	$	392	$	—	$	—	$	392
U.S. government agency bonds	—		19,808		—		19,808
Total Assets	$	392	$	19,808	$	—	$	20,200

Liabilities:
Contingent Liability	$	—	$	—	$	996	$	996
Warrant Liabilities	—		—		5,548		5,548
Total Liabilities	$	—	$	—	$	6,544	$	6,544

Preferred Purchase Agreement	6 Months Ended
Preferred Purchase Agreement	Jun. 30, 2024
Preferred Purchase Agreement [Abstract]
Preferred Purchase Agreement	Preferred Purchase Agreement On March 27, 2023, we entered into a securities purchase agreement with certain accredited investors (the “Preferred Purchase Agreement”), pursuant to which on March 29, 2023, the Company issued and sold, in a private placement (the “Series F Preferred Offering”), (i) 24,900 shares of Series F-1 Convertible Preferred Stock, par value $0.01 per share (the “Series F-1 Preferred Stock”), (ii) tranche A warrants (the “Preferred Tranche A Warrants”) to acquire 34,859 shares of Series F-3 Convertible Preferred Stock, par value $0.01 per share (the “Series F-3 Preferred Stock”) and (iii) tranche B warrants (the “Preferred Tranche B Warrants”, together with the Preferred Tranche A Warrant, the “Preferred Warrants”) to acquire 24,900 shares of Series F-4 Convertible Preferred Stock, par value $0.01 per share (the “Series F-4 Preferred Stock”) for an aggregate offering price of $24.9 million before deducting the fees paid to the placement agent and the financial advisors and other financing expenses payable by the Company. The gross proceeds of $24.9 million from the Series F Preferred Offering have been allocated first to the Preferred Warrant liabilities at their fair value of $4.9 million, with the residual of $20.0 million being allocated to the Series F-1 Preferred Stock. As of June 30, 2024, all of the Preferred Tranche A Warrants were exercised for an aggregate exercise price of $34.9 million and 250 Preferred Tranche B Warrants were exercised for an aggregate exercise price of $0.3 million. The remaining Preferred Tranche B Warrants are exercisable for 24,650 shares of Series F-4 Preferred Stock, with an aggregate exercise price of $24.7 million until the earlier of (i) 21 days following the Company’s announcement of receipt of at least $10 million in quarterly U.S. revenue from the commercialization of HEPZATO and (ii) March 31, 2026. Pursuant to the Certificate of Designation of Preferences, Rights and Limitations of the Series F Convertible Voting Preferred Stock (the “Certificate of Designation”), each share of Series F-1 Preferred Stock automatically converted into shares of common stock and/or, if applicable (in accordance with the beneficial ownership limitations then in effect), shares of Series F-2 Preferred Stock, par value $0.01 per share (the “Series F-2 Preferred Stock” and, together with the Series F-1 Preferred Stock, the Series F-3 Preferred Stock and the Series F-4 Preferred Stock, the “Series F Preferred Stock”) in lieu of common stock. Subject to limitations set forth in the Certificate of Designation, the shares of Series F-2, F-3 and F-4 Preferred Stock are convertible into common stock at the option of the holder at the conversion price of $3.30 per share, $4.50 per share and $6.00 per share, respectively, rounded down to the nearest whole share, and in each case subject to the terms and limitations contained in the Certificate of Designation. As of June 30, 2024, 58,924 shares of the Company’s Series F-1, F-2, F-3 and F-4 Preferred Stock were converted into 15,005,211 shares of common stock. As of June 30, 2024, there were 1,085 shares of Series F-2 Preferred Stock, and no shares of Series F-3 Preferred Stock or Series F-4 Preferred Stock outstanding. The Series F-2, F-3 and F-4 Preferred Stock are not mandatorily redeemable, redeemable at the holder’s election or contingently redeemable at the holder’s election (at this point, a Deemed Liquidation Event would potentially trigger pro rata liquidation payments to the preferred and common stockholders on a pro rata “as converted” basis). Accordingly, the Series F-2, F-3 and F-4 Preferred are now classified as permanent equity. The Company determined that the outstanding Preferred Warrants should be liability-classified. See Note 15 for a discussion of the accounting treatment of the Common Warrants and Preferred Warrants.

Stockholders' Equity - Preferred Stock Warrants (Details) - Preferred Warrants - $ / shares	6 Months Ended	12 Months Ended
	Jun. 30, 2024	Dec. 31, 2023
Class of Warrant or Right [Line Items]
Outstanding, beginning of period (in shares)	24,900
Warrants issued (in shares)	0
Warrants exercised (in shares)	(250)
Outstanding, end of period (in shares)	24,650	24,900
Outstanding, beginning of period (in dollars per share)	$ 1,000
Warrants issued (in dollars per share)
Warrants exercised (in dollars per share)	1,000
Outstanding, ending of period (in dollars per share)	$ 1,000	$ 1,000
Weighted Average Remaining Life (in years), Outstanding	1 year 9 months 18 days	2 years 3 months 18 days

Stockholders' Equity - Summary of Stock Option Activity (Details) $ / shares in Units, $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2024 USD ($) $ / shares shares	Dec. 31, 2023 USD ($) $ / shares shares
Number of Options
Outstanding, beginning of period (in shares) \| shares	4,183,232
Granted (in shares) \| shares	2,213,096
Exercised (in shares) \| shares	(32,300)
Expired (in shares) \| shares	(46,956)
Cancelled/Forfeited (in shares) \| shares	(184,958)
Outstanding, end of period (in shares) \| shares	6,132,114	4,183,232
Exercisable (in shares) \| shares	2,995,121
Unvested at June 30, 2024 (in shares) \| shares	3,136,993
Weighted Average Exercise Price Per Share
Outstanding, Weighted Average Exercise Price Per Share, beginning of period (in dollars per share)	$ 8.17
Granted, Weighted Average Exercise Price Per Share (in dollars per share)	5.01
Exercised, Weighted Average Exercise Price Per Share (in dollars per share)	5.22
Expired, Weighted Average Exercise Price Per Share (in dollars per share)	8.63
Cancelled/Forfeited, Weighted Average Exercise Price Per Share (in dollars per share)	5.88
Outstanding, Weighted Average Exercise Price Per Share, end of period (in dollars per share)	7.11	$ 8.17
Weighted Average Exercise Price, Exercisable (in dollars per share)	8.95
Weighted Average Exercise Price, Unvested (in dollars per share)	5.36
Weighted Average Grant Date Fair Value Per Share
Outstanding, Weighted average grant date fair value at beginning of period (in dollars per share)	7.60
Weighted average estimated fair value of the stock options granted (in dollars per share)	4.09
Exercised, Weighted average grant date fair value (in dollars per share)	4.15
Expired, Weighted average grant date fair value (in dollars per share)	8.34
Expired, Weighted average grant date fair value (in dollars per share)	5.49
Ending, Weighted average grant date fair value at beginning of period (in dollars per share)	6.41	$ 7.60
Exercisable, Weighted average grant date fair value (in dollars per share)	8.17
Unvested Weighted average grant date fair value (in dollars per share)	$ 4.73
Weighted Average Remaining Contractual Term (in years) and Aggregate Intrinsic Value
Weighted Average Remaining Contractual Term (in years), Outstanding	8 years 4 months 24 days	8 years 3 months 18 days
Weighted Average Remaining Contractual Term (in years), Granted	9 years 6 months
Weighted Average Remaining Contractual Term (in years), Exercisable	7 years 4 months 24 days
Weighted Average Remaining Contractual Term (in years), Unvested	9 years 3 months 18 days
Aggregate Intrinsic Value, Outstanding \| $	$ 12,902	$ 147
Aggregate Intrinsic Value, Exercised \| $	60
Aggregate Intrinsic Value, Exercisable \| $	3,443
Aggregate Intrinsic Value, Unvested \| $	$ 9,459

Loans and Convertible Notes Payable - Summary of Loans and Convertible Notes Payable (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Loans and notes payable, gross	$ 4,503	$ 10,610
Discount	(12)	(460)
Total - Loans and notes payable	$ 4,491	10,150
Percentage of final payment included in gross amount	4.25%
Final payment	$ 500
Loans Payable
Debt Instrument [Line Items]
Loans and notes payable, current, gross	0	5,610
Discount, current	0	(371)
Loans and notes payable, current, net	0	5,239
Convertible Notes Payable
Debt Instrument [Line Items]
Loans and notes payable, current, gross	4,503	5,000
Discount, current	(12)	(89)
Loans and notes payable, current, net	$ 4,491	$ 4,911

Inventory - Narrative (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Inventory [Line Items]
Finished goods	$ 564	$ 126
Inventory Held at Hospitals and Treatment Centers
Inventory [Line Items]
Finished goods	$ 300

Property, Plant, and Equipment (Tables)

6 Months Ended

Jun. 30, 2024

Property, Plant and Equipment [Abstract]

Schedule of Property, Plant, and Equipment

Property, plant, and equipment consist of the following:


(In thousands)	June 30, 2024		December 31, 2023		Estimated Useful Life
Buildings and land	$	1,318	$	1,318	30 years - Buildings
Enterprise hardware and software	1,855		1,857		3 years
Leaseholds	1,776		1,787		Lesser of lease term or estimated useful life
Equipment	1,348		1,263		7 years
Furniture	238		202		5 years
Construction in process	10		—
Property, plant and equipment, gross	6,545		6,427
Accumulated depreciation	(5,123)		(5,075)
Property, plant and equipment, net	$	1,422	$	1,352

Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Income Statement [Abstract]
Product revenue	$ 7,766	$ 495	$ 10,905	$ 1,092
Total revenues	7,766	495	10,905	1,092
Cost of goods sold	(1,519)	(150)	(2,422)	(331)
Gross profit	6,247	345	8,483	761
Operating expenses:
Research and development expenses	3,394	3,555	7,094	8,131
Selling, general and administrative expenses	6,765	4,787	15,579	8,952
Total operating expenses	10,159	8,342	22,673	17,083
Operating loss	(3,912)	(7,997)	(14,190)	(16,322)
Change in fair value of warrant liability	(9,755)	1,160	(10,367)	1,160
Interest expense, net	(84)	(371)	(283)	(1,059)
Other (expense) income	10	6	(12)	19
Net loss	(13,741)	(7,202)	(24,852)	(16,202)
Other comprehensive (loss) income:
Unrealized gain (loss) on investments	(141)	0	(133)	0
Foreign currency translation adjustments	(8)	0	6	19
Total comprehensive loss	$ (13,890)	$ (7,202)	$ (24,979)	$ (16,183)
Common share data:
Basic loss per common share (in dollars per share)	$ (0.48)	$ (0.58)	$ (0.93)	$ (1.35)
Diluted loss per common share (in dollars per share)	$ (0.48)	$ (0.58)	$ (0.93)	$ (1.35)
Weighted average number of basic shares outstanding (in shares)	28,364,731	12,463,665	26,625,955	12,035,738
Weighted average number of diluted shares outstanding (in shares)	28,364,731	12,463,665	26,625,955	12,035,738

Leases - Narrative (Details) $ in Millions			3 Months Ended		6 Months Ended
Leases - Narrative (Details) $ in Millions	Jan. 18, 2024 USD ($) ft²	Aug. 02, 2021 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)
Lessee Lease Description [Line Items]
Lease term			12 months		12 months
Operating lease expense (less than)			$ 0.1	$ 0.1	$ 0.1	$ 0.2
Sub-Lease 2021
Lessee Lease Description [Line Items]
Lease term		5 years
Annual rent expense		$ 0.1
Queensbury Lease
Lessee Lease Description [Line Items]
Lease term	5 years
Annual rent expense	$ 0.2
Area of space \| ft²	18,000
Lease term an additional	5 years

Stockholders' Equity - Summary of Common Stock Warrants Outstanding and Exercisable (Details) - $ / shares	6 Months Ended	12 Months Ended
	Jun. 30, 2024	Dec. 31, 2023	Mar. 31, 2023	Aug. 06, 2021
Class of Warrant or Right [Line Items]
Warrant exercise price (in dollars per share)			$ 0.01	$ 0.01
Common Warrants
Class of Warrant or Right [Line Items]
Outstanding Number of Warrants (in shares)	4,364,830	4,665,201
Warrants Exercisable, Weighted Average Remaining Warrant Term (in years)	1 year 1 month 6 days	1 year 7 months 6 days
Warrants Exercisable, Number of Warrants (in shares)	4,364,830
$0.01
Class of Warrant or Right [Line Items]
Warrant exercise price (in dollars per share)	$ 0.01
$0.01 \| Common Warrants
Class of Warrant or Right [Line Items]
Outstanding Number of Warrants (in shares)	737,421
Warrants Exercisable, Weighted Average Remaining Warrant Term (in years)	3 years 1 month 6 days
Warrants Exercisable, Number of Warrants (in shares)	737,421
$6.00
Class of Warrant or Right [Line Items]
Warrant exercise price (in dollars per share)	$ 6.00
$6.00 \| Common Warrants
Class of Warrant or Right [Line Items]
Outstanding Number of Warrants (in shares)	16,666
Warrants Exercisable, Weighted Average Remaining Warrant Term (in years)	1 year 9 months 18 days
Warrants Exercisable, Number of Warrants (in shares)	16,666
$10.00
Class of Warrant or Right [Line Items]
Warrant exercise price (in dollars per share)	$ 10
$10.00 \| Common Warrants
Class of Warrant or Right [Line Items]
Outstanding Number of Warrants (in shares)	3,610,743
Warrants Exercisable, Weighted Average Remaining Warrant Term (in years)	8 months 12 days
Warrants Exercisable, Number of Warrants (in shares)	3,610,743

Stockholders' Equity - June 2024 Shelf Registration Statement (Details) - USD ($) $ / shares in Units, $ in Millions	Jun. 30, 2024	Jun. 28, 2024	Mar. 31, 2024	Dec. 31, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022
Subsidiary or Equity Method Investee [Line Items]
Common stock, par value (in dollars per share)	$ 0.01		$ 0.01	$ 0.01	$ 0.01	$ 0.01	$ 0.01
Preferred stock, par value (in dollars per share)	$ 0.01		$ 0.01	$ 0.01	$ 0.01	$ 0.01	$ 0.01
June 2024 Shelf Registration Statement
Subsidiary or Equity Method Investee [Line Items]
Common stock, par value (in dollars per share)		$ 0.01
Preferred stock, par value (in dollars per share)		$ 0.01
Maximum aggregate offering price of securities under shelf registration		$ 150

Preferred Purchase Agreement (Details) - USD ($) $ / shares in Units, $ in Thousands			6 Months Ended
	Aug. 14, 2023	Mar. 29, 2023	Jun. 30, 2024	Jun. 30, 2023	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022
Disclosure Of Preferred Purchase Agreement [Line Items]
Preferred stock, par value (in dollars per share)			$ 0.01	$ 0.01	$ 0.01	$ 0.01	$ 0.01	$ 0.01
Fair value of warrant liabilities			$ 16,559			$ 6,544
Proceeds from exercise of warrants			259	$ 5
Deferred revenue		$ 10,000	$ 10,000
Preferred stock, shares outstanding (in shares)			12,342			24,819
Series F1, F2, F3 and F4 Preferred Stock
Disclosure Of Preferred Purchase Agreement [Line Items]
Conversion of shares (in shares)			(58,924)
Series F-2
Disclosure Of Preferred Purchase Agreement [Line Items]
Preferred stock, par value (in dollars per share)			$ 3.30
Preferred stock, shares outstanding (in shares)			1,085
Series F-3
Disclosure Of Preferred Purchase Agreement [Line Items]
Preferred stock, par value (in dollars per share)			$ 4.50
Preferred stock, shares outstanding (in shares)			0
Series F-4
Disclosure Of Preferred Purchase Agreement [Line Items]
Preferred stock, par value (in dollars per share)			$ 6.00
Preferred stock, shares outstanding (in shares)			0
Common Stock
Disclosure Of Preferred Purchase Agreement [Line Items]
Conversion of shares (in shares)			15,005,211
Preferred Purchase Agreement \| Series F-1
Disclosure Of Preferred Purchase Agreement [Line Items]
Preferred stock, par value (in dollars per share)		$ 0.01
Preferred Purchase Agreement \| Series F-2
Disclosure Of Preferred Purchase Agreement [Line Items]
Preferred stock, par value (in dollars per share)			$ 0.01
Preferred Purchase Agreement \| Series F-3
Disclosure Of Preferred Purchase Agreement [Line Items]
Preferred stock, par value (in dollars per share)		0.01
Preferred Purchase Agreement \| Series F-4
Disclosure Of Preferred Purchase Agreement [Line Items]
Preferred stock, par value (in dollars per share)		$ 0.01
Series F-1 \| Preferred Purchase Agreement
Disclosure Of Preferred Purchase Agreement [Line Items]
Number of exercisable preferred warrants (in shares)		24,900
Preferred Tranche A Warrant
Disclosure Of Preferred Purchase Agreement [Line Items]
Proceeds from exercise of warrants	$ 10,000
Preferred Tranche A Warrant \| Series F-3
Disclosure Of Preferred Purchase Agreement [Line Items]
Number of exercisable preferred warrants (in shares)		34,859
Preferred Tranche A Warrant \| Preferred Purchase Agreement
Disclosure Of Preferred Purchase Agreement [Line Items]
Aggregate exercise price of preferred warrants			$ 34,900
Preferred Tranche B Warrant \| Preferred Purchase Agreement
Disclosure Of Preferred Purchase Agreement [Line Items]
Number of exercisable preferred warrants (in shares)		24,900
Aggregate exercise price of preferred warrants			$ 24,700
Class of warrant or right, number of warrants exercised (in shares)			250
Proceeds from exercise of warrants			$ 300
Warrant exercise period			21 days
Preferred Warrant Liabilities
Disclosure Of Preferred Purchase Agreement [Line Items]
Proceeds from issuance of warrants		$ 24,900
Fair value of warrant liabilities		4,900
Preferred Warrant Liabilities \| Series F-1
Disclosure Of Preferred Purchase Agreement [Line Items]
Proceeds from issuance of warrants		$ 20,000
Series F-4 \| Preferred Purchase Agreement
Disclosure Of Preferred Purchase Agreement [Line Items]
Number of exercisable preferred warrants (in shares)			24,650