Delcath Systems (DCTH) 10-Q 11 May 21 2021 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2021	May 11, 2021
Cover [Abstract]
Entity Registrant Name	DELCATH SYSTEMS, INC.
Entity Central Index Key	0000872912
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Document Quarterly Report	true
Document Transition Report	false
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Incorporation, State or Country Code	DE
Entity Interactive Data Current	Yes
Entity File Number	001-16133
Entity Tax Identification Number	06-1245881
Entity Address, Address Line One	1633 Broadway
Entity Address Address Line2	Suite 22C
Entity Address City Or Town	New York
Entity Address State Or Province	NY
Entity Address Postal Zip Code	10019
City Area Code	212
Local Phone Number	489-2100
Entity Shell Company	false
Entity Current Reporting Status	Yes
Entity Common Stock, Shares Outstanding		6,472,398
Document Fiscal Year Focus	2021
Trading Symbol	DCTH
Title of 12(b) Security	Common stock, $0.01 par value per share
Document Fiscal Period Focus	Q1
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2021
Security Exchange Name	NASDAQ

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Current assets
Cash and cash equivalents	$ 26,600	$ 28,575
Restricted cash	50	181
Accounts receivable, net	75	57
Inventories	1,109	855
Prepaid expenses and other current assets	2,369	2,670
Total current assets	30,203	32,338
Property, plant and equipment, net	1,321	1,351
Right-of-use assets	791	946
Total assets	32,315	34,635
Current liabilities
Accounts payable	1,234	1,774
Accrued expenses	5,927	5,241
Deferred revenue, current	502	525
Lease liabilities, current	433	495
Convertible notes payable, current	2,000	2,000
Total current liabilities	10,096	10,035
Deferred revenue, non-current	1,856	2,072
Lease liabilities, non-current	357	450
Total liabilities	12,309	12,557
Commitments and contingencies (Note 13)
Stockholders' equity
Preferred stock, $.01 par value; 10,000,000 shares authorized; 20,480 and 20,631 shares issued and outstanding at March 31, 2021 and December 31, 2020, respectively
Common stock, $.01 par value; 40,000,000 shares authorized; 6,251,257 and 5,996,101 shares issued and outstanding at March 31, 2021 and December 31, 2020, respectively	63	60
Additional paid-in capital	422,027	417,449
Accumulated deficit	(402,074)	(395,327)
Accumulated other comprehensive income	(10)	(104)
Total stockholders' equity	20,006	22,078
Total liabilities and stockholders' equity	$ 32,315	$ 34,635

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - $ / shares	Mar. 31, 2021	Dec. 31, 2020
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)	20,480	20,631
Preferred stock, shares outstanding (in shares)	20,480	20,631
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	40,000,000	40,000,000
Common stock, shares issued (in shares)	6,251,257	5,996,101
Common stock, shares outstanding (in shares)	6,251,257	5,996,101

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cost of goods sold	$ (112)	$ (78)
Gross profit	276	216
Operating expenses:
Research and development expenses	3,707	2,974
Selling, general and administrative expenses	3,296	2,316
Total operating expenses	7,003	5,290
Operating loss	(6,727)	(5,074)
Change in fair value of the warrant liability, net		(2,832)
Interest expense, net	(41)	(36)
Other income	21	81
Net loss	(6,747)	(7,861)
Other comprehensive (loss) income:
Foreign currency translation adjustments	94	65
Total other comprehensive loss	$ (6,653)	$ (7,796)
Common share data:
Basic loss per common share	$ (1.04)	$ (108.07)
Diluted loss per common share	$ (1.04)	$ (108.07)
Weighted average number of basic shares outstanding	6,496,922	72,740
Weighted average number of diluted shares outstanding	6,496,922	72,740
Product Revenue [Member]
Revenue	$ 261	$ 176
Other Revenue [Member]
Revenue	$ 127	$ 118

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Stockholders' Equity (Deficit) (Unaudited) - USD ($) $ in Thousands	Total	Preferred Stock [Member]	Common Stock [Member]	Additional Paid In Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Income [Member]
Balance at Dec. 31, 2019	$ (6,357)		$ 1	$ 364,785	$ (371,171)	$ 28
Balance (in shares) at Dec. 31, 2019		41,517	67,091
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Compensation expense for issuance of stock options	25			25
Shares settled for services	30			30
Shares settled for services (in shares)			2,717
Conversion of Preferred stock into common stock (in shares)		(70)	2,915
Fractional rounding related to Reverse stock split			$ 50
Registration costs	(106)			(106)
Fair value of warrants issued	6,199			6,199
Net loss	(7,861)				(7,861)
Total comprehensive income (loss)	65					65
Balance at Mar. 31, 2020	(8,005)		$ 1	370,933	(379,032)	93
Balance (in shares) at Mar. 31, 2020		41,447	72,773
Balance at Dec. 31, 2020	22,078		$ 60	417,449	(395,327)	(104)
Balance (in shares) at Dec. 31, 2020		20,631	5,996,101
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Compensation expense for issuance of stock options	2,148			2,148
Shares settled for services	57			$ 57
Shares settled for services (in shares)			2,636
Conversion of Preferred stock into common stock (in shares)		(150)	15,000
Exercise of warrants into common stock	2,376		$ 3
Exercise of warrants into common stock (in shares)			237,520	2,373
Net loss	(6,747)				(6,747)
Total comprehensive income (loss)	94					94
Balance at Mar. 31, 2021	$ 20,006		$ 63	$ 422,027	$ (402,074)	$ (10)
Balance (in shares) at Mar. 31, 2021		20,481	6,251,257

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash flows from operating activities:
Net loss	$ (6,747)	$ (7,861)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock option compensation expense	2,148	25
Restricted stock compensation expense		30
Depreciation expense	39	48
Amortization of right of use assets		11
Warrant liability fair value adjustment		2,832
Non-cash interest income	(1)	(3)
Interest expense accrued related to convertible notes	39	40
Changes in assets and liabilities:
(Increase) decrease in prepaid expenses and other assets	302	(880)
Increase in accounts receivable	(18)	(48)
Increase in inventories	(254)	(136)
Increase in accounts payable and accrued expenses	164	901
Decrease in deferred revenue	(239)	(188)
Net cash used in operating activities	(4,567)	(5,229)
Cash flows from investing activities:
Purchase of property, plant and equipment	(9)	(180)
Net cash used in investing activities	(9)	(180)
Cash flows from financing activities:
Principal payments on financing leases		(11)
Net payments related to registration costs		(106)
Net proceeds from the exercise of warrants	2,376
Net cash provided by/(used in) financing activities	2,376	(117)
Foreign currency effects on cash	94	64
Net decrease in total cash	(2,106)	(5,462)
Total Cash:
Beginning of period	28,756	10,183
End of period	26,650	4,721
Supplemental Disclosure of Cash Flow Information:
Interest expense	3	4
Supplemental Disclosure of Non-Cash Investing and Financing Activities:
Reclassification of 2019 warrants from liability to equity		$ 6,199
Board of Directors Chairman
Supplemental Disclosure of Non-Cash Investing and Financing Activities:
Issuance of restricted stock for accrued fees due to a former board member	$ 57

General

General	3 Months Ended
	Mar. 31, 2021
Organization Consolidation And Presentation Of Financial Statements [Abstract]
General	(1) General The unaudited interim condensed consolidated financial statements of Delcath Systems, Inc. (“Delcath” or the “Company”) as of and for the three months ended March 31, 2021 and 2020 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, 2020 (the “Annual Report”), which was filed with the Securities and Exchange Commission (the “SEC”) on March 31, 2021 and may also be found on the Company’s website (www.delcath.com). In these notes to the condensed consolidated financial statements the terms “us”, “we” or “our” refer to Delcath and its consolidated subsidiaries. Description of Business We are an interventional oncology company focused on the treatment of primary and metastatic liver cancers. Our lead product candidate, the HEPZATO™ KIT (melphalan hydrochloride for injection/hepatic delivery system), or HEPZATO™, is a drug/device combination product. HEPZATO is designed to administer high-dose chemotherapy to the liver while controlling systemic exposure and associated side effects. In Europe, our commercial product is a stand-alone medical device having the same device components as the HEPZATO KIT but without the melphalan hydrochloride. The device is approved for sale under the trade name CHEMOSAT® Hepatic Delivery System for Melphalan, or CHEMOSAT, where it has been used at major medical centers to treat a wide range of cancers of the liver. Our clinical development program for HEPZATO is primarily comprised of the FOCUS Clinical Trial for Patients with Hepatic Dominant Ocular Melanoma (FOCUS Trial), a global registration clinical trial that is investigating objective response rate in metastatic ocular melanoma, or mOM. We are currently reviewing the incidence, unmet need, available efficacy data and development requirements for a broad set of liver cancers in order to select a portfolio of follow-on indications which will maximize the value of the HEPZATO platform. Risks and Uncertainties Due to the global outbreak of SARS-CoV-2, a novel strain of coronavirus that causes Coronavirus disease (COVID-19), the Company experienced an impact on certain areas of its business. These effects included a slowing of patient recruitment in the FOCUS trial and a reduction in the pace at which we can monitor data at our clinical trial sites. The resulting delay in completing enrollment and additional time required to monitor data caused our announcement for the top-line data from our FOCUS Trial to shift to early 2021 and to be modified to a preliminary analysis. We now plan to submit a New Drug Application (NDA) to the FDA in the first quarter of 2022 for the treatment of mOM. The ability to achieve this goal is contingent on our ability to monitor data at our clinical sites and therefore the timeline may shift as access to the clinical sites changes in response to the rapidly evolving situation. We have also experienced an increased volatility in EU commercial product revenue and additional impacts to the business may arise that we are not aware of currently. The ultimate impact of the pandemic on the Company’s results of operations, financial position, liquidity, or capital resources cannot be reasonably estimated at this time. Liquidity and Going Concern The accompanying interim condensed consolidated financial statements have been prepared on a going concern basis, which contemplates the realization of assets and the satisfaction of liabilities in the normal course of business. The Company has incurred losses since inception and expects to continue incurring losses for the next several years. These losses, among other factors, raise substantial doubt about the Company’s ability to continue as a going concern. The Company’s existence is dependent upon management’s ability to obtain additional funding sources or to enter into strategic alliances. Adequate additional financing may not be available to the Company on acceptable terms, or at all. If the Company is unable to raise additional capital and/or enter into strategic alliances when needed or on attractive terms, it would be forced to delay, reduce, or eliminate its research and development programs or any commercialization efforts. There can be no assurance that the Company’s efforts will result in the resolution of the Company’s liquidity needs. If Delcath is not able to continue as a going concern, it is likely that holders of its common stock will lose all of their investment. The accompanying interim condensed The Company anticipates incurring additional losses until such time, if ever, that it can generate significant sales. These circumstances raise substantial doubt about the Company's ability to continue as a going concern within one year after the date that the financial statements are issued . 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 entities controlled by Delcath 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 March 31, 2021 and 2020; however, certain information and footnote disclosures normally included in our audited consolidated financial statements included in our Annual Report on Form 10-K 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, 2020, except for the following: Reclassifications . Certain prior period balances have been reclassified in order to conform to current period presentation. These reclassifications have no effect on previously reported results of operations or loss per share. Recently Adopted Accounting Pronouncements In December 2019, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2019-12, Simplifying the Accounting for Income Taxes. The list of changes is comprehensive; however the changes will not significantly impact the Company due to the full valuation allowance that is recorded against the Company’s deferred tax assets. Early adoption of ASU 2019-12 is permitted, including adoption in any interim period for public business entities for periods for which financial statements have not yet been issued. An entity that elects to early adopt the amendments in an interim period should reflect any adjustments as of the beginning of the annual period that includes that interim period. Additionally, an entity that elects early adoption must adopt all the amendments in the same period. The Company adopted ASU 2019-12 on January 1, 2021 and there was no material impact on the Company’s financial statements or disclosures.

Cash, Cash Equivalents and Rest

Cash, Cash Equivalents and Restricted Cash	3 Months Ended
	Mar. 31, 2021
Cash And Cash Equivalents [Abstract]
Cash, Cash Equivalents and Restricted Cash	(2) Cash, Cash Equivalents and Restricted Cash Cash and cash equivalents that are restricted as to withdrawal or use under the terms of certain contractual agreements are recorded in Restricted Cash Cash, cash equivalents, and r estricted cash balances were as follows: March 31, December 31, 2021 2020 Cash and cash equivalents $ 26,600 $ 28,575 Letters of credit — 131 Security for credit cards 50 50 Total cash, cash equivalents and restricted cash shown in the statements of cash flows $ 26,650 $ 28,756

Inventories

Inventories	3 Months Ended
	Mar. 31, 2021
Inventory Disclosure [Abstract]
Inventories	(3) Inventories Inventories consist of the following: March 31, December 31, 2021 2020 Raw materials $ 486 $ 435 Work-in-process 623 420 Total inventories $ 1,109 $ 855

Prepaid Expenses and Other Curr

Prepaid Expenses and Other Current Assets	3 Months Ended
	Mar. 31, 2021
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]
Prepaid Expenses And Other Current Assets	(4) Prepaid Expenses and Other Current Assets Prepaid expenses and other current assets consist of the following: March 31, December 31, 2021 2020 Clinical trial expenses $ 1,497 $ 1,497 Insurance premiums 498 845 Professional services 125 66 Other 249 262 Total prepaid expenses and other current assets $ 2,369 $ 2,670

Property, Plant, and Equipment

Property, Plant, and Equipment	3 Months Ended
	Mar. 31, 2021
Property Plant And Equipment [Abstract]
Property, Plant, and Equipment	(5) Property, Plant, and Equipment Property, plant, and equipment consist of the following: March 31, December 31, Estimated 2021 2020 Useful Life Buildings and land $ 1,120 $ 1,109 30 years - Buildings Enterprise hardware and software 1,861 1,862 3 years Leaseholds 1,809 1,826 Lesser of lease term or estimated useful life Equipment 1,061 1,063 7 years Furniture 203 204 5 years Property, plant and equipment, gross 6,054 6,064 Accumulated depreciation (4,733 ) (4,713 ) Property, plant and equipment, net $ 1,321 $ 1,351 On July 31, 2020, the Company exercised its option to purchase its 95-97 Park Road office location in Queensbury, NY for $460.3, pursuant to the terms of the lease agreement dated September 17, 2018, as amended on January 29, 2019, and further amended on July 31, 2020. Depreciation expense for the three months ended March 31, 2021 was approximately $38.8 as compared to approximately $47.6 for the same period in 2020.

Accrued Expenses

Accrued Expenses	3 Months Ended
	Mar. 31, 2021
Payables And Accruals [Abstract]
Accrued Expenses	(6) Accrued Expenses Accrued expenses consist of the following: March 31, December 31, 2021 2020 Clinical expenses $ 3,511 $ 2,698 Compensation, excluding taxes 1,514 1,598 Professional fees 335 225 Interest on convertible note 274 234 Other 293 486 Total accrued expenses $ 5,927 $ 5,241

Leases

Leases	3 Months Ended
	Mar. 31, 2021
Leases [Abstract]
Leases	(7) 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 and financing 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. The following table summarizes the Company’s operating leases as of and for the three months ended March 31, 2021: US Ireland Total Lease cost Operating lease cost $ 112 $ 57 $ 169 Sublease income — (44 ) (44 ) Total $ 112 $ 13 $ 125 Other information Operating cash flows out from operating leases (112 ) (57 ) (169 ) Operating cash flows in from operating leases - 44 44 Weighted average remaining lease term 1.9 0.3 Weighted average discount rate - operating leases 8 % 8 % Remaining maturities of the Company’s operating leases, excluding short-term leases, are as follows: US Ireland Total Year ended December 31, 2021 $ 304 $ 73 $ 377 Year ended December 31, 2022 406 - 406 Year ended December 31, 2023 67 - 67 Total 777 73 850 Less present value discount (59 ) (1 ) (60 ) Operating lease liabilities included in the condensed consolidated balance sheet at March 31, 2021 $ 718 $ 72 $ 790

Convertible Notes Payable

Convertible Notes Payable	3 Months Ended
	Mar. 31, 2021
Debt Disclosure [Abstract]
Convertible Notes Payable	(8) Convertible notes payable Conversion price Current interest rate Principal Current convertible notes payable 8.0% July 2019 Notes (maturity date - July 16, 2021) $ 1,500 8 % $ 2,000 The note payable is convertible into Preferred Stock.

Stockholders' Equity

Stockholders' Equity	3 Months Ended
	Mar. 31, 2021
Stockholders Equity Note [Abstract]
Stockholders' Equity	(9) Stockholders’ Equity Preferred Stock Series E and Series E-1 Preferred Stock During the three months ended March 31, 2021, 150 shares of Preferred Stock were converted into 15,000 shares of the Company’s common stock. As of March 31, 2021, there were an aggregate of 20,481 shares of Series E and Series E-1 Preferred Stock outstanding. Other Common Stock Issuances During the three months ended March 31, 2021, the Company issued 237,520 shares of common stock associated with the exercise of warrants. Issuance of Unregistered Securities In February 2021, the Company issued 2,636 shares of unregistered common stock in lieu of a cash payment of deferred accrued director fees to a former director. Stock Incentive Plans 2020 Omnibus Equity Incentive Plan As of March 31, 2021, there were 675,000 shares of the Company’s common stock reserved under the 2020 Plan, of which 95,000 remained available to be issued. On March 30, 2021, the Company’s Board of Directors approved an amendment of the 2020 Plan to increase the number of shares of the Company’s common stock available for issuance under the 2020 Plan by 1,800,000, subject to stockholder approval of the amendment. The amendment of the 2020 Plan was approved by the stockholders at the Company’s annual meeting of stockholders held on May 6, 2021 and, effective as of such date, the number of shares of the Company’s common stock available for issuance under the 2020 Plan increased by 1,800,000 resulting in a total share reserve of 2,475,000 shares of common stock. Share-Based Compensation The following is a summary of stock option activity under the 2019 Plan and the 2020 Plan for the three months ended March 31, 2021: Number of Option Weighted Average Exercise Price Per Share Weighted Average Remaining Contractual Term (in years) Aggregate Intrinsic Value Outstanding at January 1, 2021 1,078,499 $ 12.68 Granted — — Exercised — — Cancelled/Forfeited — — Outstanding at March 31, 2021 1,078,499 $ 12.68 9.5 $ 710 Exercisable at March 31, 2021 175,164 $ 13.05 9.5 $ 131 The following table summarizes information for stock option shares outstanding and exercisable at March 31, 2021 Options Exercisable Range of Exercise Prices Outstanding Number of Options Weighted Average Remaining Option Term (in years) Number of Options $10 - $15 946,000 9.5 157,665 $15 - $20 81,000 9.5 8,500 $20 - $25 51,000 9.5 8,500 $25+ 499 7.8 499 1,078,499 9.5 175,164 The following is a summary of share-based compensation expense in the statement of operations for the three months ended March 31, 2021 Three months ended March 31, 2021 2020 Selling, general and administrative $ 1,466 $ 49 Research and development 630 5 Cost of goods sold 52 — Total $ 2,148 $ 55 At March 31, 2021, there was $6,677 of aggregate unrecognized compensation expense related employee and board stock option grants. This will be recognized over the next 33 months. Warrants The following is a summary of warrant activity for the three months ended March 31, 2021: Warrants Weighted Average Exercise Price Weighted Average Remaining Life (in years) Aggregate Intrinsic Value Outstanding at January 1, 2021 4,236,687 $ 9.13 Warrants issued — — Warrants exercised (242,580 ) 10.00 Warrants expired — — Outstanding at March 31, 2021 3,994,107 $ 9.07 3.9 $ 13,372 Exercisable at March 31, 2021 3,994,107 $ 9.07 3.9 $ 13,372 The following table presents information related to stock warrants at March 31, 2021 Warrants Exercisable Range of Exercise Prices Outstanding Number of Warrants Weighted Average Remaining Warrant Term (in years) Number of Warrants $ 0.01 371,000 4.1 371,000 $ 10.00 3,623,107 3.9 3,623,107 3,994,107 3.9 3,994,107 As of March 31, 2021, warrants to purchase 371,000 shares of the Company’s common stock were pre-funded, and the exercise price was $0.01 per share. The remaining warrants were exercisable at $10.00 per share.

Fair Value Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2021
Fair Value Disclosures [Abstract]
Fair Value Measurements	(10) Fair Value Measurements As a result of the expiration of certain provisions in the 2019 Warrants, the $6,199 fair value of the 2019 Warrants was reclassified from liability to equity on February 19, 2020. The fair value of the outstanding warrants at February 19, 2020, the date the 2019 Warrants were no longer classified as a liability, was determined by using option pricing models with the following assumptions: February 19, 2020 Expected life (in years) 4.3 Expected volatility 208.2% Risk-free interest rates 1.4%

Net Loss per Common Share

Net Loss per Common Share	3 Months Ended
	Mar. 31, 2021
Earnings Per Share [Abstract]
Net Loss per Common Share	(11) Net Loss per Common 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 and 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 March 31, 2021 and 2020 because their effects would be anti-dilutive: March 31, 2021 2020 Stock options 1,078,499 1,640 Common stock warrants - equity 3,994,107 1,826,599 Common stock reserved for conversion of preferred shares 2,048,101 1,799,093 Assumed conversion of convertible notes 146,288 63,493 Total 7,266,995 3,690,825 At March 31, 2021, the Company had 371,000 pre-funded warrants outstanding. The following table provides a reconciliation of the weighted average shares outstanding calculation for the three months ended March 31, 2021 and 2020: Three months ended March 31, 2021 2020 Weighted average shares issued 6,125,922 72,740 Weighted average pre-funded warrants 371,000 - Weighted average shares outstanding 6,496,922 72,740

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2021
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	(1 2 ) Commitments and Contingencies Litigation, Claims and Assessments Following the May 18, 2020 resignation (effective June 1, 2020) of Jennifer Simpson, the Company’s former President and Chief Executive Officer, and Barbra Keck, the Company’s former Chief Financial Officer (the “Claimants”), it became evident that there was a dispute regarding the Company’s compensation obligations to the Claimants. In a letter dated June 29, 2020, an attorney representing the Claimants made certain claims and threatened litigation against the Company. On or about July 27, 2020, the Claimants filed a statement of claim with the American Arbitration Association against the Company. The Claimants seek payment of certain purported unpaid compensation amounts claimed to be due to them, in an approximate amount of $1,140 in the aggregate, as well as unspecified statutory damages under New York Labor Law, attorneys’ fees and costs, and statutory interest. The Company intends to defend the claims vigorously. The arbitrator had scheduled hearings to take place during the week of May 17, 2021. However, the Claimants and the Company recently agreed to participate in non-binding mediation of their dispute before a neutral mediator, which resulted in the arbitration proceedings being placed in abeyance pending the outcome of the mediation process. At this time, the mediation process between the Claimants and the Company is ongoing. As of March 31, 2021, the Company has accrued for the full purported unpaid compensation amounts.

Subsequent Events

Subsequent Events	3 Months Ended
	Mar. 31, 2021
Subsequent Events [Abstract]
Subsequent Events	(1 3 ) Subsequent Events Stock Warrant Exercises Subsequent to March 31, 2021, warrants to purchase 6,141 shares of the Company’s common stock with an exercise price of $10.00 per share were exercised for proceeds of $61.4. In addition, pre-funded warrants to purchase 215,000 shares of the Company’s common stock with an exercise price of $0.01 per share were exercised for proceeds of $2.2. Other Transactions In April 2021, the Company issued an invoice for $1,178 to medac, the Company’s EU product distribution partner, for the achievement of the milestone requirement pertaining to the positive results related to the FOCUS trial, as outlined in the License, Supply and Marketing Agreement dated December 10, 2018 between the Company and medac.

General (Policies)

General (Policies)	3 Months Ended
	Mar. 31, 2021
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Risk and Uncertainties	Risks and Uncertainties Due to the global outbreak of SARS-CoV-2, a novel strain of coronavirus that causes Coronavirus disease (COVID-19), the Company experienced an impact on certain areas of its business. These effects included a slowing of patient recruitment in the FOCUS trial and a reduction in the pace at which we can monitor data at our clinical trial sites. The resulting delay in completing enrollment and additional time required to monitor data caused our announcement for the top-line data from our FOCUS Trial to shift to early 2021 and to be modified to a preliminary analysis. We now plan to submit a New Drug Application (NDA) to the FDA in the first quarter of 2022 for the treatment of mOM. The ability to achieve this goal is contingent on our ability to monitor data at our clinical sites and therefore the timeline may shift as access to the clinical sites changes in response to the rapidly evolving situation. We have also experienced an increased volatility in EU commercial product revenue and additional impacts to the business may arise that we are not aware of currently. The ultimate impact of the pandemic on the Company’s results of operations, financial position, liquidity, or capital resources cannot be reasonably estimated at this time.
Liquidity and Going Concern	Liquidity and Going Concern The accompanying interim condensed consolidated financial statements have been prepared on a going concern basis, which contemplates the realization of assets and the satisfaction of liabilities in the normal course of business. The Company has incurred losses since inception and expects to continue incurring losses for the next several years. These losses, among other factors, raise substantial doubt about the Company’s ability to continue as a going concern. The Company’s existence is dependent upon management’s ability to obtain additional funding sources or to enter into strategic alliances. Adequate additional financing may not be available to the Company on acceptable terms, or at all. If the Company is unable to raise additional capital and/or enter into strategic alliances when needed or on attractive terms, it would be forced to delay, reduce, or eliminate its research and development programs or any commercialization efforts. There can be no assurance that the Company’s efforts will result in the resolution of the Company’s liquidity needs. If Delcath is not able to continue as a going concern, it is likely that holders of its common stock will lose all of their investment. The accompanying interim condensed The Company anticipates incurring additional losses until such time, if ever, that it can generate significant sales. These circumstances raise substantial doubt about the Company's ability to continue as a going concern within one year after the date that the financial statements are issued .
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 entities controlled by Delcath 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 March 31, 2021 and 2020; however, certain information and footnote disclosures normally included in our audited consolidated financial statements included in our Annual Report on Form 10-K 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.
Reclassifications	Reclassifications . Certain prior period balances have been reclassified in order to conform to current period presentation. These reclassifications have no effect on previously reported results of operations or loss per share.
Recently Adopted and Issued Accounting Pronouncements	Recently Adopted Accounting Pronouncements In December 2019, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2019-12, Simplifying the Accounting for Income Taxes. The list of changes is comprehensive; however the changes will not significantly impact the Company due to the full valuation allowance that is recorded against the Company’s deferred tax assets. Early adoption of ASU 2019-12 is permitted, including adoption in any interim period for public business entities for periods for which financial statements have not yet been issued. An entity that elects to early adopt the amendments in an interim period should reflect any adjustments as of the beginning of the annual period that includes that interim period. Additionally, an entity that elects early adoption must adopt all the amendments in the same period. The Company adopted ASU 2019-12 on January 1, 2021 and there was no material impact on the Company’s financial statements or disclosures.

Cash, Cash Equivalents and Re_2

Cash, Cash Equivalents and Restricted Cash (Tables)	3 Months Ended
	Mar. 31, 2021
Cash And Cash Equivalents [Abstract]
Schedule of Cash, Cash Equivalents, and Restricted Cash	Cash, cash equivalents, and r estricted cash balances were as follows: March 31, December 31, 2021 2020 Cash and cash equivalents $ 26,600 $ 28,575 Letters of credit — 131 Security for credit cards 50 50 Total cash, cash equivalents and restricted cash shown in the statements of cash flows $ 26,650 $ 28,756

Inventories (Tables)

Inventories (Tables)	3 Months Ended
	Mar. 31, 2021
Inventory Disclosure [Abstract]
Schedule of inventories	Inventories consist of the following: March 31, December 31, 2021 2020 Raw materials $ 486 $ 435 Work-in-process 623 420 Total inventories $ 1,109 $ 855

Prepaid Expenses and Other Cu_2

Prepaid Expenses and Other Current Assets (Tables)	3 Months Ended
	Mar. 31, 2021
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]
Prepaid Expenses and Other Current Assets	Prepaid expenses and other current assets consist of the following: March 31, December 31, 2021 2020 Clinical trial expenses $ 1,497 $ 1,497 Insurance premiums 498 845 Professional services 125 66 Other 249 262 Total prepaid expenses and other current assets $ 2,369 $ 2,670

Property, Plant, and Equipment

Property, Plant, and Equipment (Tables)	3 Months Ended
	Mar. 31, 2021
Property Plant And Equipment [Abstract]
Components of property, plant and equipment	Property, plant, and equipment consist of the following: March 31, December 31, Estimated 2021 2020 Useful Life Buildings and land $ 1,120 $ 1,109 30 years - Buildings Enterprise hardware and software 1,861 1,862 3 years Leaseholds 1,809 1,826 Lesser of lease term or estimated useful life Equipment 1,061 1,063 7 years Furniture 203 204 5 years Property, plant and equipment, gross 6,054 6,064 Accumulated depreciation (4,733 ) (4,713 ) Property, plant and equipment, net $ 1,321 $ 1,351

Accrued Expenses (Tables)

Accrued Expenses (Tables)	3 Months Ended
	Mar. 31, 2021
Payables And Accruals [Abstract]
Schedule of accrued expenses	Accrued expenses consist of the following: March 31, December 31, 2021 2020 Clinical expenses $ 3,511 $ 2,698 Compensation, excluding taxes 1,514 1,598 Professional fees 335 225 Interest on convertible note 274 234 Other 293 486 Total accrued expenses $ 5,927 $ 5,241

Leases (Tables)

Leases (Tables)	3 Months Ended
	Mar. 31, 2021
Leases [Abstract]
Summary of Operating and Financing Leases	The following table summarizes the Company’s operating leases as of and for the three months ended March 31, 2021: US Ireland Total Lease cost Operating lease cost $ 112 $ 57 $ 169 Sublease income — (44 ) (44 ) Total $ 112 $ 13 $ 125 Other information Operating cash flows out from operating leases (112 ) (57 ) (169 ) Operating cash flows in from operating leases - 44 44 Weighted average remaining lease term 1.9 0.3 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: US Ireland Total Year ended December 31, 2021 $ 304 $ 73 $ 377 Year ended December 31, 2022 406 - 406 Year ended December 31, 2023 67 - 67 Total 777 73 850 Less present value discount (59 ) (1 ) (60 ) Operating lease liabilities included in the condensed consolidated balance sheet at March 31, 2021 $ 718 $ 72 $ 790

Convertible Notes Payable (Tabl

Convertible Notes Payable (Tables)	3 Months Ended
	Mar. 31, 2021
Debt Disclosure [Abstract]
Summary of Various Notes Issued	Conversion price Current interest rate Principal Current convertible notes payable 8.0% July 2019 Notes (maturity date - July 16, 2021) $ 1,500 8 % $ 2,000

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	3 Months Ended
	Mar. 31, 2021
Stockholders Equity Note [Abstract]
Summary of Stock Option Activity	The following is a summary of stock option activity under the 2019 Plan and the 2020 Plan for the three months ended March 31, 2021: Number of Option Weighted Average Exercise Price Per Share Weighted Average Remaining Contractual Term (in years) Aggregate Intrinsic Value Outstanding at January 1, 2021 1,078,499 $ 12.68 Granted — — Exercised — — Cancelled/Forfeited — — Outstanding at March 31, 2021 1,078,499 $ 12.68 9.5 $ 710 Exercisable at March 31, 2021 175,164 $ 13.05 9.5 $ 131
Summary of Stock Option Shares Outstanding and Exercisable	The following table summarizes information for stock option shares outstanding and exercisable at March 31, 2021 Options Exercisable Range of Exercise Prices Outstanding Number of Options Weighted Average Remaining Option Term (in years) Number of Options $10 - $15 946,000 9.5 157,665 $15 - $20 81,000 9.5 8,500 $20 - $25 51,000 9.5 8,500 $25+ 499 7.8 499 1,078,499 9.5 175,164
Summary of Recognized Share-based Compensation Cost	The following is a summary of share-based compensation expense in the statement of operations for the three months ended March 31, 2021 Three months ended March 31, 2021 2020 Selling, general and administrative $ 1,466 $ 49 Research and development 630 5 Cost of goods sold 52 — Total $ 2,148 $ 55
Summary of Warrant Activity	The following is a summary of warrant activity for the three months ended March 31, 2021: Warrants Weighted Average Exercise Price Weighted Average Remaining Life (in years) Aggregate Intrinsic Value Outstanding at January 1, 2021 4,236,687 $ 9.13 Warrants issued — — Warrants exercised (242,580 ) 10.00 Warrants expired — — Outstanding at March 31, 2021 3,994,107 $ 9.07 3.9 $ 13,372 Exercisable at March 31, 2021 3,994,107 $ 9.07 3.9 $ 13,372
Schedule of Information Related to Stock Warrants Outstanding and Exercisable	The following table presents information related to stock warrants at March 31, 2021 Warrants Exercisable Range of Exercise Prices Outstanding Number of Warrants Weighted Average Remaining Warrant Term (in years) Number of Warrants $ 0.01 371,000 4.1 371,000 $ 10.00 3,623,107 3.9 3,623,107 3,994,107 3.9 3,994,107

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2021
Fair Value Disclosures [Abstract]
Schedule of fair value of the outstanding warrants	The fair value of the outstanding warrants at February 19, 2020, the date the 2019 Warrants were no longer classified as a liability, was determined by using option pricing models with the following assumptions: February 19, 2020 Expected life (in years) 4.3 Expected volatility 208.2% Risk-free interest rates 1.4%

Net Loss per Common Share (Tabl

Net Loss per Common Share (Tables)	3 Months Ended
	Mar. 31, 2021
Earnings Per Share [Abstract]
Anti-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 March 31, 2021 and 2020 because their effects would be anti-dilutive: March 31, 2021 2020 Stock options 1,078,499 1,640 Common stock warrants - equity 3,994,107 1,826,599 Common stock reserved for conversion of preferred shares 2,048,101 1,799,093 Assumed conversion of convertible notes 146,288 63,493 Total 7,266,995 3,690,825
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 months ended March 31, 2021 and 2020: Three months ended March 31, 2021 2020 Weighted average shares issued 6,125,922 72,740 Weighted average pre-funded warrants 371,000 - Weighted average shares outstanding 6,496,922 72,740

Cash, Cash Equivalents and Re_3

Cash, Cash Equivalents and Restricted Cash - Schedule of Cash, Cash Equivalents, and Restricted Cash (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Cash And Cash Equivalents [Abstract]
Cash and cash equivalents	$ 26,600	$ 28,575
Letters of credit		131
Security for credit cards	50	50
Total cash, cash equivalents and restricted cash shown in the statements of cash flows	$ 26,650	$ 28,756	$ 4,721	$ 10,183

Inventories - Schedule of Inven

Inventories - Schedule of Inventories (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Inventory Disclosure [Abstract]
Raw materials	$ 486	$ 435
Work-in-process	623	420
Total inventories	$ 1,109	$ 855

Prepaid Expenses and Other Cu_3

Prepaid Expenses and Other Current Assets - Schedule of Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Prepaid Expense And Other Assets Current [Abstract]
Clinical trial expenses	$ 1,497	$ 1,497
Insurance premiums	498	845
Professional services	125	66
Other	249	262
Total prepaid expenses and other current assets	$ 2,369	$ 2,670

Property, Plant, and Equipmen_2

Property, Plant, and Equipment - Components of Property, Plant, and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 6,054	$ 6,064
Accumulated depreciation	(4,733)	(4,713)
Property, plant and equipment, net	1,321	1,351
Buildings and Land [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	1,120	1,109
Enterprise Hardware and Software [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 1,861	1,862
Property, plant and equipment, estimated useful life	3 years
Leaseholds [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 1,809	1,826
Property, plant and equipment, estimated useful life	Lesser of lease term or estimated useful life
Equipment [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 1,061	1,063
Property, plant and equipment, estimated useful life	7 years
Furniture [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 203	$ 204
Property, plant and equipment, estimated useful life	5 years
Buildings [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, estimated useful life	30 years

Property, Plant, and Equipmen_3

Property, Plant, and Equipment - Additional Information (Details) - USD ($)	Jul. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Property Plant And Equipment [Abstract]
Exercised option to purchase	$ 460,300
Depreciation expense		$ 38,800	$ 47,600

Accrued Expenses - Schedule of

Accrued Expenses - Schedule of Accrued Expenses (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Payables And Accruals [Abstract]
Clinical expenses	$ 3,511	$ 2,698
Compensation, excluding taxes	1,514	1,598
Professional fees	335	225
Interest on convertible note	274	234
Other	293	486
Total accrued expenses	$ 5,927	$ 5,241

Leases - Additional Information

Leases - Additional Information (Details)	Mar. 31, 2021
Leases [Abstract]
Lease term	12 months

Leases - Summary of Operating a

Leases - Summary of Operating and Financing Leases (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021USD ($)
Lease cost
Operating lease cost	$ 169
Sublease income	(44)
Total	125
Other information
Operating cash flows out from operating leases	(169)
Operating cash flows in from operating leases	44
U.S. [Member]
Lease cost
Operating lease cost	112
Total	112
Other information
Operating cash flows out from operating leases	$ (112)
Weighted average remaining lease term	1 year 10 months 25 days
Weighted average discount rate - operating leases	8.00%
Ireland [Member]
Lease cost
Operating lease cost	$ 57
Sublease income	(44)
Total	13
Other information
Operating cash flows out from operating leases	(57)
Operating cash flows in from operating leases	$ 44
Weighted average remaining lease term	3 months 19 days
Weighted average discount rate - operating leases	8.00%

Leases - Schedule of Remaining

Leases - Schedule of Remaining Maturity of Operating Leases Excluding Short-Term Leases (Details) $ in Thousands	Mar. 31, 2021USD ($)
Lessee Lease Description [Line Items]
Year ended December 31, 2021	$ 377
Year ended December 31, 2022	406
Year ended December 31, 2023	67
Total	850
Less present value discount	(60)
Operating lease liabilities included in the condensed consolidated balance sheet at March 31, 2021	790
U.S. [Member]
Lessee Lease Description [Line Items]
Year ended December 31, 2021	304
Year ended December 31, 2022	406
Year ended December 31, 2023	67
Total	777
Less present value discount	(59)
Operating lease liabilities included in the condensed consolidated balance sheet at March 31, 2021	718
Ireland [Member]
Lessee Lease Description [Line Items]
Year ended December 31, 2021	73
Total	73
Less present value discount	(1)
Operating lease liabilities included in the condensed consolidated balance sheet at March 31, 2021	$ 72

Convertible Notes Payable - Sum

Convertible Notes Payable - Summary of Various Notes Issued (Details) - Convertible Notes Payable [Member] - 8.0% July 2019 Notes [Member]	Mar. 31, 2021USD ($)$ / shares
Debt Instrument [Line Items]
Conversion price | $ / shares	$ 1,500
Current interest rate	8.00%
Principal | $	$ 2,000

Convertible Notes Payable - S_2

Convertible Notes Payable - Summary of Various Notes Issued (Details) (Parenthetical)	3 Months Ended
	Mar. 31, 2021
Equity Method Investments And Cost Method Investments [Abstract]
Maturity date	Jul. 16, 2021

Stockholders' Equity - Preferre

Stockholders' Equity - Preferred Stock Issuances - Additional Information (Details) - shares	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Stockholders Equity Note [Line Items]
Conversion of stock shares issued	15,000
Preferred stock, shares outstanding (in shares)	20,480	20,631
Series E Preferred Stock [Member]
Stockholders Equity Note [Line Items]
Conversion of stock preferred shares converted	150
Preferred stock, shares outstanding (in shares)	20,481
Series E1 Preferred Stock [Member]
Stockholders Equity Note [Line Items]
Conversion of stock preferred shares converted	150
Preferred stock, shares outstanding (in shares)	20,481

Stockholders' Equity - Common S

Stockholders' Equity - Common Stock Issuances - Additional Information (Details)	3 Months Ended
	Mar. 31, 2021shares
Stockholders Equity Note [Abstract]
Common stock associated with the exercise of warrants	237,520

Stockholders' Equity - Issuance

Stockholders' Equity - Issuance of Unregistered Securities - Additional Information (Details)	1 Months Ended
	Feb. 28, 2021shares
Stockholders Equity Note [Abstract]
Issue of unregistered common stock for advisory services	2,636

Stockholders' Equity - Stock In

Stockholders' Equity - Stock Incentive Plans - Additional Information (Details) - 2020 Omnibus Equity Incentive Plan [Member]	Mar. 31, 2021shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of common shares reserved for issuance	675,000
Number of common shares remained available to be issued	95,000
Number of increased common shares for future issuance	1,800,000
Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of common shares reserved for issuance	2,475,000

Stockholders' Equity - Summary

Stockholders' Equity - Summary of Stock Option Activity (Details) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2021USD ($)$ / sharesshares
Stockholders Equity Note [Abstract]
Number of Shares, Outstanding | shares	1,078,499
Number of Shares, Outstanding | shares	1,078,499
Number of Shares, Exercisable | shares	175,164
Weighted Average Exercise Price, Outstanding | $ / shares	$ 12.68
Weighted Average Exercise Price, Outstanding | $ / shares	12.68
Weighted Average Exercise Price, Exercisable | $ / shares	$ 13.05
Weighted Average Remaining Contractual Term (Years), Outstanding	9 years 6 months
Weighted Average Remaining Contractual Term (Years), Exercisable	9 years 6 months
Aggregate Intrinsic Value, Outstanding | $	$ 710
Aggregate Intrinsic Value, Exercisable | $	$ 131

Stockholders' Equity - Summar_2

Stockholders' Equity - Summary of Stock Option Shares Outstanding and Exercisable (Details) - shares	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Outstanding Number of Options	1,078,499	1,078,499
Weighted Average Remaining Contractual Term (Years), Outstanding	9 years 6 months
Number of Shares, Exercisable	175,164
$10 - $15 [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Outstanding Number of Options	946,000
Weighted Average Remaining Contractual Term (Years), Outstanding	9 years 6 months
Number of Shares, Exercisable	157,665
$15 - $20 [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Outstanding Number of Options	81,000
Weighted Average Remaining Contractual Term (Years), Outstanding	9 years 6 months
Number of Shares, Exercisable	8,500
$20 - $25 [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Outstanding Number of Options	51,000
Weighted Average Remaining Contractual Term (Years), Outstanding	9 years 6 months
Number of Shares, Exercisable	8,500
+ $25 [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Outstanding Number of Options	499
Weighted Average Remaining Contractual Term (Years), Outstanding	7 years 9 months 18 days
Number of Shares, Exercisable	499

Stockholders' Equity - Summar_3

Stockholders' Equity - Summary of Recognized Share-based Compensation Cost (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Share-based compensation (Income) expense	$ 2,148	$ 55
Selling, General and Administrative [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Share-based compensation (Income) expense	1,466	49
Research and Development [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Share-based compensation (Income) expense	630	$ 5
Cost of Goods Sold [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Share-based compensation (Income) expense	$ 52

Stockholders' Equity - Share-Ba

Stockholders' Equity - Share-Based Compensation - Additional Information (Details) $ in Thousands	Mar. 31, 2021USD ($)
Stockholders Equity Note [Abstract]
Unrecognized compensation expense related to non-vested share-based compensation awards	$ 6,677

Stockholders' Equity - Summar_4

Stockholders' Equity - Summary of Warrant Activity (Details) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2021USD ($)$ / sharesshares
Warrants outstanding [Roll Forward]
Outstanding, beginning of period (in shares) | shares	4,236,687
Warrants exercised (in shares) | shares	(242,580)
Outstanding, end of period (in shares) | shares	3,994,107
Exercisable, end of period (in shares) | shares	3,994,107
Warrants, Exercise Price per Share [Roll Forward]
Outstanding, beginning of period (in dollars per share) | $ / shares	$ 9.13
Outstanding, ending of period (in dollars per share) | $ / shares	9.07
Warrants exercised (in dollars per share) | $ / shares	10
Exercisable, (in dollars per share) | $ / shares	$ 9.07
Weighted average remaining life	3 years 10 months 24 days
Weighted average remaining life, Exercisable	3 years 10 months 24 days
Aggregate Intrinsic Value, Outstanding | $	$ 13,372
Aggregate Intrinsic Value, Exercisable | $	$ 13,372

Stockholders' Equity - Summar_5

Stockholders' Equity - Summary of Warrants Outstanding and Exercisable (Details) - shares	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Class Of Warrant Or Right [Line Items]
Warrants Outstanding, Number Outstanding	3,994,107	4,236,687
Weighted average remaining life	3 years 10 months 24 days
Warrants Exercisable, Number Exercisable	3,994,107
$0.01 [Member]
Class Of Warrant Or Right [Line Items]
Warrants Outstanding, Number Outstanding	371,000
Weighted average remaining life	4 years 1 month 6 days
Warrants Exercisable, Number Exercisable	371,000
$10.00 [Member]
Class Of Warrant Or Right [Line Items]
Warrants Outstanding, Number Outstanding	3,623,107
Weighted average remaining life	3 years 10 months 24 days
Warrants Exercisable, Number Exercisable	3,623,107

Stockholders' Equity - Warrants

Stockholders' Equity - Warrants - Additional Information (Details) - $ / shares	Mar. 31, 2021	Dec. 31, 2020
Class Of Warrant Or Right [Line Items]
Warrants Outstanding, Number Outstanding	3,994,107	4,236,687
Warrant exercise price	$ 10
Prefunded Warrant [Member]
Class Of Warrant Or Right [Line Items]
Warrants Outstanding, Number Outstanding	371,000
Warrant exercise price	$ 0.01

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Details) $ in Thousands	Feb. 19, 2020USD ($)
Fair Value Disclosures [Abstract]
Fair value of warrants reclassified from liability to equity	$ 6,199

Fair Value Measurements - Sched

Fair Value Measurements - Schedule of Fair Value of Outstanding Warrants (Details)	Feb. 19, 2020
Contractual Term [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Warrant expiration period	4 years 3 months 18 days
Expected Volatility [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Warrants measurement input	2.082
Risk-free Interest Rates [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Warrants measurement input	0.014

Net Loss per Common Share - Ant

Net Loss per Common Share - Anti-Dilutive Securities Excluded from Computation of Earnings Per Share (Details) - shares	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	7,266,995	3,690,825
Stock Options [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	1,078,499	1,640
Common Stock Warrants - Equity [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	3,994,107	1,826,599
Common Stock Reserved For Conversion of Preferred Shares [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	2,048,101	1,799,093
Assumed Conversion of Convertible Notes [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	146,288	63,493

Net Loss per Common Share - Add

Net Loss per Common Share - Additional Information (Details)	3 Months Ended
	Mar. 31, 2021shares
Earnings Per Share [Abstract]
Pre-funded penny warrants outstanding	371,000

Net Loss per Common Share - Sum

Net Loss per Common Share - Summary of Reconciliation of Weighted Average Shares Outstanding Calculation (Details) - shares	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Earnings Per Share [Abstract]
Weighted average shares issued	6,125,922	72,740
Weighted average pre-funded warrants	371,000
Weighted average shares outstanding	6,496,922	72,740

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Details) - Pending Litigation [Member] - USD ($) $ in Thousands	Jul. 27, 2020	Mar. 31, 2021
Loss Contingencies [Line Items]
Unpaid compensation amounts claimed	$ 1,140
Accrued unpaid compensation amounts		$ 1,140

Subsequent Events - Additional

Subsequent Events - Additional Information (Details) - USD ($)	Apr. 01, 2021	Mar. 31, 2021
Subsequent Event [Line Items]
Warrant exercise price		$ 10
Proceeds from warrant exercises		$ 2,376,000
Prefunded Warrant [Member]
Subsequent Event [Line Items]
Warrant exercise price		$ 0.01
Subsequent Event [Member] | Medac [Member]
Subsequent Event [Line Items]
Due from related parties	$ 1,178,000
Agreement date	Dec. 10, 2018
Subsequent Event [Member] | Prefunded Warrant [Member]
Subsequent Event [Line Items]
Warrants issued to purchase of common stock	215,000
Warrant exercise price	$ 0.01
Proceeds from warrant exercises	$ 2,200
Stock Warrant Exercises [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Warrants issued to purchase of common stock	6,141
Warrant exercise price	$ 10
Proceeds from warrant exercises	$ 61,400