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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, 2016 USD ($) ft²	Dec. 31, 2016 EUR (€)	Dec. 31, 2015 USD ($)
Operating Leased Assets [Line Items]
Rent expense			$ 500,000		$ 400,000
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 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
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
Delcath's European Headquarters Lease Agreement [Member] | Year 6 Through 10 [Member]
Operating Leased Assets [Line Items]
Annual base rent			197,377	€ 187,209
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. 01, 2019	Mar. 01, 2019
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

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

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Expansion option of office space square footage - (building designed primarily for the conduct of business, for example, but not limited to, administration, clerical services, and consultation).

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Term of leasing arrangements under operating leases.

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Date the credit facility terminates, in CCYY-MM-DD format.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Section 50
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