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Description of Business	12 Months Ended
	Dec. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business	(1) Description of Business Delcath Systems, Inc. (“Delcath” or the “Company”) is an interventional oncology company focused on the treatment of primary and metastatic liver cancers. The Company’s 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, and 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. The Company’s clinical development program for HEPZATO was comprised of the FOCUS Clinical Trial for Patients with Hepatic Dominant Ocular Melanoma (the “FOCUS Trial”), a global registration clinical trial investigating objective response rate in metastatic ocular melanoma, or mOM, a type of primary liver cancer. The Company is 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. In the United States, HEPZATO is considered a combination drug and device product regulated by the Food and Drug Administration (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 ocular melanoma, cutaneous melanoma, cholangiocarcinoma, hepatocellular carcinoma, and neuroendocrine tumor indications and one for doxorubicin in the hepatocellular carcinoma indication). HEPZATO has not been approved for sale in the United States. In December 2021, the Company announced that the FOCUS Trial of HEPZATO met its pre-specified endpoint. On February 14, 2023 filed a New Drug Application resubmission to the FDA for the HEPZATO Kit (melphalan hydrochloride for Injection/Hepatic Delivery System) seeking approval for the treatment of patients with unresectable hepatic-dominant metastatic ocular melanoma (mOM). On March 20, 2023, the FDA determined the resubmission constituted a complete response and set a Prescription Drug User Fee Act target action date of August 14, 2023. The resubmission is in response to a September 12, 2013 Complete Response Letter (CRL) from the FDA. The NDA resubmission contains comprehensive data and information relating to the matters identified in the CRL. We continue to promote our early access programs in the United States to make HEPZATO readily available to mOM patients. We are focused on continuing to treat these patients with mOM as regulatory approval is sought in the United States. There are currently patients enrolled in our early access program sites. On February 28, 2022, CHEMOSAT received Medical Device Regulation certification under the European Medical Devices Regulation [2017/745/EU], which may be considered by jurisdictions when evaluating reimbursement. As of March 1, 2022, the Company has assumed direct responsibility for sales, marketing and distribution of CHEMOSAT in Europe. 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, any increase in COVID cases and associated restrictions, 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. Any 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 The accompanying 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. As shown in the accompanying consolidated financial statements, during the year ended December 31, 2022, the Company incurred net losses of $36.5 million and used $25.0 million of cash for its operating activities. These factors among others raise substantial doubt about the Company’s ability to continue as a going concern for a reasonable period of time. On July 20, 2022, the Company closed a private placement for the issuance and sale of 690,954 shares of common stock and 566,751 pre-funded warrants to purchase common stock 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. The Company received gross proceeds from the private placement of approximately $5.0 million before deducting offering expenses. On December 13, 2022, the Company closed a private placement for the issuance and sale of 1,448,889 shares of common stock and 692,042 pre-funded warrants to purchase common stock to certain investors. Each share of common stock was sold at a price per share of $2.90 and the pre-funded warrants were sold at a price of $2.89 per pre-funded warrant. The pre-funded warrants have an exercise price of $0.01 per share of Common Stock and are immediately exercisable. The Company received gross proceeds from the private placement of approximately $6.2 million before deducting offering expenses. 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 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.

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The entire disclosure for the business description and basis of presentation concepts. Business description describes the nature and type of organization including but not limited to organizational structure as may be applicable to holding companies, parent and subsidiary relationships, business divisions, business units, business segments, affiliates and information about significant ownership of the reporting entity. Basis of presentation describes the underlying basis used to prepare the financial statements (for example, US Generally Accepted Accounting Principles, Other Comprehensive Basis of Accounting, IFRS).

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