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Commitments Additional Information (Details)	12 Months Ended
	Dec. 31, 2015 USD ($) ft²	Dec. 31, 2015 EUR (€)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Operating Leased Assets [Line Items]
Rent expense	$ 400,000		$ 2,300,000	$ 1,500,000
Rent expense related to restructuring charges	$ 1,300,000
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. 01, 2017	Feb. 01, 2017
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 1 [Member]
Operating Leased Assets [Line Items]
Annual base rent	$ 961,000
Office Space in New York, NY, Initial Lease and Lease Amendment [Member] | Year 2 [Member]
Operating Leased Assets [Line Items]
Annual base rent	970,000
Office Space in New York, NY, Initial Lease and Lease Amendment [Member] | Year 3 [Member]
Operating Leased Assets [Line Items]
Annual base rent	996,000
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
Delcath's European Headquarters Lease Agreement [Member]
Operating Leased Assets [Line Items]
Square footage of office space (in square feet) | ft²	19,200
Operating lease term	10 years	10 years
Delivery time frame of written notice, minimum	6 months	6 months
Delcath's European Headquarters Lease Agreement [Member] | Year 1 [Member]
Operating Leased Assets [Line Items]
Annual base rent	$ 115,458	€ 106,051
Delcath's European Headquarters Lease Agreement [Member] | Year 2 [Member]
Operating Leased Assets [Line Items]
Annual base rent	146,946	134,974
Delcath's European Headquarters Lease Agreement [Member] | Year 3 [Member]
Operating Leased Assets [Line Items]
Annual base rent	173,187	159,077
Delcath's European Headquarters Lease Agreement [Member] | Year 4 [Member]
Operating Leased Assets [Line Items]
Annual base rent	199,427	183,179
Delcath's European Headquarters Lease Agreement [Member] | Year 5 [Member]
Operating Leased Assets [Line Items]
Annual base rent	$ 199,427	€ 183,179
Country Club Road Lease Agreement [Member]
Operating Leased Assets [Line Items]
Square footage of office space (in square feet) | ft²	18,000
Annual base rent	$ 216,000
Operating lease term	3 years	3 years
Lease expiration period	2015-06	2015-06
Office Space at 1301 Avenue of the Americas, New York, NY [Member]
Operating Leased Assets [Line Items]
Square footage of office space (in square feet) | ft²	5,818
Annual base rent	$ 200,000
Letter of credit [Abstract]
Minimum letter of credit amount required to be maintained under lease agreement	$ 200,000
Expiration date of letter of credit	May 01, 2016	May 01, 2016
Park Road Lease Agreement [Member]
Operating Leased Assets [Line Items]
Square footage of office space (in square feet) | ft²	6,000
Lease expiration date	Oct. 31, 2016	Oct. 31, 2016
Annual base rent	$ 47,277
Operating lease term	1 year	1 year

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Area of additional office space leased through the exercise of expansion option right.

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