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Commitments (Details)
 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2012
USD ($)
Dec. 31, 2011
USD ($)
Dec. 31, 2010
USD ($)
Dec. 31, 2012
Office Space in New York, New York, Initial Lease [Member]
USD ($)
sqft
Dec. 31, 2012
Office Space in New York, New York, Lease Amendment [Member]
USD ($)
sqft
Dec. 31, 2012
Office Space in New York, New York, Initial Lease and Lease Amendment [Member]
USD ($)
Dec. 31, 2012
Facility lease agreement [Member]
USD ($)
sqft
Dec. 31, 2012
Country Club Road lease agreement [Member]
USD ($)
sqft
Dec. 31, 2012
Park Road lease agreement [Member]
USD ($)
sqft
Dec. 31, 2012
Delcath's European headquarters lease agreement [Member]
USD ($)
sqft
Dec. 31, 2012
Delcath's European headquarters lease agreement [Member]
EUR (€)
Operating Leased Assets [Line Items]                      
Square footage of office space (in square feet)       8,629     10,320 18,000 6,000 19,200 19,200
Expansion option, additional square footage of office space (in square feet)       8,629              
Annual base rent in year 1 $ 1,422,000         $ 970,000       $ 140,179 € 106,051
Annual base rent in year 2 1,460,000         996,000       178,410 134,974
Annual base rent in year 3 1,328,000         996,000       210,269 159,077
Annual base rent in year 4 1,278,000         1,000,000       242,127 183,179
Annual base rent in year 5 1,294,000                 242,127 183,179
Annual base rent payment in years 1-3 and first half of year 4       457,337              
Annual base rent payment in second half of year 4 and years 5-7       491,853              
Additional square footage of office space leased under exercise of option right (in square feet)         8,629            
Lease expiration date         Mar. 31, 2021            
Annual base rent payment in years 1-5         504,078            
Annual base rent payment in years 6-11         547,533            
Future minimum lease payments under all operating leases [Abstract]                      
2012           961,000          
2013 1,422,000         970,000       140,179 106,051
2014 1,460,000         996,000       178,410 134,974
2015 1,328,000         996,000       210,269 159,077
2016 1,278,000         1,000,000       242,127 183,179
2017 1,294,000                 242,127 183,179
2017-2021       543,627   1,100,000          
Total future minimum payments due 6,782,000                    
Operating lease term               3 years 1 year 10 years 10 years
Annual base rent               216,000 42,000    
Delivery time frame of written notice, minimum                   6 months 6 months
Purchase price if acquired by September 1, 2009             440,000        
Rent expense 1,500,000 1,200,000 500,000                
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. 01, 2014