General (Policies)	6 Months Ended
General (Policies)	Jun. 30, 2022
Accounting Policies [Abstract]
Risk and Uncertainties	Risks and Uncertainties Although the Company is not aware of any direct impacts of the war between the Ukraine and the Russian Federation on its supply chain, the war could adversely impact the Company’s ability to obtain components and/or significantly increase the cost of obtaining such components for the Company’s products from its third-party suppliers in a timely manner or at all. In addition, at this time, although the Company is not aware of any direct impacts, the increase in COVID cases and associated restrictions, which could adversely impact the Company’s ability to obtain components and/or significantly increase the cost of obtaining such components for the Company’s products from its third-party suppliers in a timely manner or at all. The rise in COVID cases and the associated absences from work of internal and external resources may also impact the Company’s ability to meet anticipated timelines.
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 significant losses and has an accumulated deficit of $438.8 million as of June 30, 2022. These losses, among other factors, raise substantial doubt about the Company’s ability to continue as a going concern. On July 20, 2022, Delcath closed a private placement for the issuance and sale of 690,954 shares of common stock (the “Common Stock”) and 566,751 pre-funded warrants to purchase Common Stock (the “Pre-Funded Warrants”) to certain investors. Each share of Common Stock was sold at a price per share of $3.98 and the Pre-Funded Warrants were sold at a price of $3.97 per Pre-Funded Warrant. The Pre-Funded Warrants have an exercise price of $0.01 per share of Common Stock and are immediately exercisable. Delcath received gross proceeds from the Private Placement of approximately $5.0 million before deducting offering expenses payable by Delcath. Delcath intends to use the net proceeds from the Private Placement for working capital purposes and other general corporate purposes. 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 the Company 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 consolidated financial statements do not include any adjustments that might result should the Company be unable to continue as a going concern. 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. Additional working capital will be required to continue operations. Operations of the Company are subject to certain risks and uncertainties, including, among others, uncertainty of product development and clinical trial results; uncertainty regarding regulatory approval; technological uncertainty; uncertainty regarding patents and proprietary rights; comprehensive government regulations; limited commercial manufacturing, marketing, or sales experience; and dependence on key personnel.
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, 2022 and 2021; 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.
Recently Adopted and Issued Accounting Pronouncements	Recently Adopted Accounting Pronouncements In August 2020, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2020-06, “Accounting for Convertible Instruments and Contracts in an Entity’s Own Equity.” ASU 2020-06 simplifies the accounting for certain financial instruments with characteristics of liabilities and equity, including convertible instruments and contracts in an entity’s own equity. ASU 2020-06 requires entities to provide expanded disclosures about the terms and features of convertible instruments and amends certain guidance in Accounting Standards Codification 260, Earnings per Share, relating to the computation of earnings per share for convertible instruments and contracts in an entity’s own equity. The guidance becomes effective for the Company on January 1, 2024, with early adoption permitted. The Company early adopted ASU 2020-06 on January 1, 2022 and the adoption did not have any immediate effect on the Company’s condensed consolidated financial statements. Going forward, the Company will no longer be required to assess convertible instruments for beneficial conversion features. In October 2020, the FASB issued ASU 2020-10 “Codification Improvements”, which improves consistency by amending the Codification to include all disclosure guidance in the appropriate disclosure sections and clarifies application of various provisions in the Codification by amending and adding new headings, cross referencing to other guidance, and refining or correcting terminology. The guidance was effective for the Company beginning in the first quarter of fiscal year 2022 with early adoption permitted. The Company adopted this guidance on January 1, 2022 and it did not have a material impact on its condensed consolidated financial statements. On May 3, 2021, the FASB issued ASU 2021-04, “Earnings Per Share” (Topic 260), “Debt—Modifications and Extinguishments” (Subtopic 470-50), “Compensation—Stock Compensation” (Topic 718), and “Derivatives and Hedging—Contracts in Entity’s Own Equity” (Subtopic 815-40): “Issuer’s Accounting for Certain Modifications or Exchanges of Freestanding Equity-Classified Written Call Options.” This new standard provides clarification and reduces diversity in an issuer’s accounting for modifications or exchanges of freestanding equity-classified written call options (such as warrants) that remain equity classified after modification or exchange. This standard is effective for fiscal years beginning after December 15, 2021, including interim periods within those fiscal years. Issuers should apply the new standard prospectively to modifications or exchanges occurring after the effective date of the new standard. Early adoption is permitted, including adoption in an interim period. If an issuer elects to early adopt the new standard in an interim period, the guidance should be applied as of the beginning of the fiscal year that includes that interim period. The Company adopted this guidance on January 1, 2022 and it did not have a material impact on its condensed consolidated financial statements.