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Document and Entity Information
 6 Months Ended
Jun. 30, 2019
Document And Entity Information [Abstract]  
Entity Registrant Name DELCATH SYSTEMS, INC.
Entity Central Index Key 0000872912
Entity Filer Category Non-accelerated Filer
Entity Small Business true
Entity Emerging Growth Company false
Entity Tax Identification Number 061245881
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
Document Type S-1/A
Amendment Flag true
Amendment Description Amendment No. 2 to Form S-1
Document Period End Date Jun. 30, 2019