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General - Additional Information (Details)
 3 Months Ended 9 Months Ended
Jul. 21, 2016
shares
Jul. 19, 2016
Jun. 13, 2016
USD ($)
Jun. 06, 2016
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
Dec. 31, 2015
USD ($)
Class Of Stock [Line Items]                    
Reverse stock split ratio 0.0625                  
Reverse stock split ratio, description             On July 19, 2016, shareholders of the Company approved, through a shareholder vote, an amendment to the Company’s Amended and Restated Certificate of Incorporation authorizing the Board of Directors to effect a reverse stock split of Delcath’s common stock at a ratio within a range of one-for-ten (1:10) to one-for-twenty (1:20). The reverse stock split became effective on July 21, 2016 at which time Delcath’s common stock began trading on the NASDAQ Stock Exchange on a one-for-sixteen (1:16) split-adjusted basis. All owners of record as of the open of the NASDAQ market on July 21, 2016 received one issued and outstanding share of Delcath common stock in exchange for sixteen issued and outstanding shares of Delcath common stock.      
Number of fractional shares were issued in connection with the reverse stock split | shares 0                  
Reverse stock split effective date             Jul. 21, 2016      
Net loss         $ 1,005,000 $ 2,422,000 $ 9,485,000 $ 9,611,000    
Net cash used in operating activities             10,597,000 $ 12,188,000    
Accumulated deficit         270,703,000   270,703,000     $ 261,217,000
Senior Secured Convertible Notes [Member]                    
Class Of Stock [Line Items]                    
Debt instrument, principal face amount         $ 35,000,000   $ 35,000,000   $ 35,000,000  
Senior Secured Convertible Notes [Member] | Series C Warrants [Member]                    
Class Of Stock [Line Items]                    
Debt instrument, principal face amount                 $ 35,000,000  
Senior Secured Convertible Notes [Member] | Securities Purchase Agreement [Member]                    
Class Of Stock [Line Items]                    
Debt instrument, principal face amount     $ 35,000,000 $ 35,000,000            
Proceeds from issuance of notes available for general corporate purposes     3,000,000 3,000,000            
Cash proceeds from notes held     29,200,000 29,200,000            
Senior Secured Convertible Notes [Member] | Securities Purchase Agreement [Member] | First Release Date on December 31, 2016 [Member]                    
Class Of Stock [Line Items]                    
Cash proceeds from notes held     3,000,000 3,000,000            
Senior Secured Convertible Notes [Member] | Securities Purchase Agreement [Member] | Subsequent Release Dates Beginning in January 2017 [Member]                    
Class Of Stock [Line Items]                    
Cash proceeds from notes held     26,200,000 26,200,000            
Senior Secured Convertible Notes [Member] | Securities Purchase Agreement [Member] | Series C Warrants [Member]                    
Class Of Stock [Line Items]                    
Proceeds from issuance of notes     $ 32,200,000 $ 32,200,000            
Minimum [Member]                    
Class Of Stock [Line Items]                    
Reverse stock split ratio   0.1                
Maximum [Member]                    
Class Of Stock [Line Items]                    
Reverse stock split ratio   0.05