Cover Page - shares	3 Months Ended
	Mar. 31, 2023	May 22, 2023
Cover [Abstract]
Entity Registrant Name	DELCATH SYSTEMS, INC.
Entity Central Index Key	0000872912
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
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 Line Two	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 Common Stock, Shares Outstanding		10,620,813
Document Period End Date	Mar. 31, 2023
Document Fiscal Year Focus	2023
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
Security Exchange Name	NASDAQ