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Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2025
Feb. 13, 2026
Jun. 30, 2025
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2025    
Current Fiscal Year End Date --12-31    
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 (518)    
Local Phone Number 743-8892    
Title of 12(b) Security Common stock, $0.01 par value per share    
Trading Symbol DCTH    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
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    
ICFR Auditor Attestation Flag false    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 419,743,586
Entity Common Stock, Shares Outstanding   34,746,187  
Documents Incorporated by Reference
DOCUMENTS INCORPORATED BY REFERENCE
Portions of the registrant’s Proxy Statement for the 2026 Annual Meeting of Stockholders are incorporated by reference in Part III of this Annual Report on Form 10-K to the extent stated herein. Such proxy statement will be filed with the Securities and Exchange Commission within 120 days of the registrant’s fiscal year ended December 31, 2025. Except with respect to information specifically incorporated by reference in this Form 10-K, the Proxy Statement is not deemed to be filed as part of this Annual Report on Form 10-K. 		   
Entity Central Index Key 0000872912    
Document Fiscal Period Focus FY    
Amendment Flag false    
Document Fiscal Year Focus 2025