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Commitments - Additional Information (Detail)
 1 Months Ended 12 Months Ended
Oct. 31, 2016
USD ($)
ft²
Mar. 31, 2016
USD ($)
ft²
Dec. 31, 2017
USD ($)
ft²
Dec. 31, 2017
EUR (€)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Operating Leased Assets [Line Items]            
Rent expense     $ 600,000   $ 500,000 $ 400,000
Office Space At 1633 Broadway, New York, NY [Member]            
Operating Leased Assets [Line Items]            
Square footage of office space (in square feet) | ft²   6,877        
Annual base rent   $ 522,652        
Letter of credit [Abstract]            
Minimum letter of credit amount required to be maintained under lease agreement         $ 130,663  
Expiration date of letter of credit     Mar. 31, 2019 Mar. 31, 2019    
Office Space at 810 Seventh Avenue, New York, NY [Member]            
Operating Leased Assets [Line Items]            
Square footage of office space (in square feet) | ft²     8,629      
Expansion option, additional square footage of office space (in square feet) | ft²     8,629      
Letter of credit [Abstract]            
Minimum letter of credit amount required to be maintained under lease agreement     $ 881,297      
Expiration date of letter of credit     Feb. 28, 2019 Feb. 28, 2019    
Office Space in New York, NY, Lease Amendment [Member]            
Operating Leased Assets [Line Items]            
Additional square footage of office space leased under exercise of option right (in square feet) | ft²     8,629      
Lease expiration date     Mar. 31, 2021 Mar. 31, 2021    
Office Space in New York, NY, Initial Lease and Lease Amendment [Member] | Year 4 [Member]            
Operating Leased Assets [Line Items]            
Annual base rent     $ 996,000      
Office Space in New York, NY, Initial Lease and Lease Amendment [Member] | Year 5 [Member]            
Operating Leased Assets [Line Items]            
Annual base rent     1,000,000      
Office Space in New York, NY, Initial Lease and Lease Amendment [Member] | Years Thereafter [Member]            
Operating Leased Assets [Line Items]            
Annual base rent     $ 1,100,000      
Park Road Lease Agreement [Member]            
Operating Leased Assets [Line Items]            
Square footage of office space (in square feet) | ft² 6,000          
Annual base rent $ 48,223          
Operating lease term     2 years 2 years    
Lease expiration period     2018-10 2018-10    
Delcath's European Headquarters Lease Agreement [Member]            
Operating Leased Assets [Line Items]            
Square footage of office space (in square feet) | ft²     19,200      
Annual base rent     $ 143,726 € 183,179    
Operating lease term     10 years 10 years