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Commitments - Additional Information (Details)	1 Months Ended	12 Months Ended
	Jan. 31, 2019 USD ($) ft²	Dec. 31, 2019 USD ($) ft²	Dec. 31, 2018 USD ($)	Sep. 30, 2018 ft²
Operating Leased Assets [Line Items]
Rent expense, net of receipts under the terms of subleases		$ 500,000	$ 600,000
Park Road Lease Agreement [Member]
Operating Leased Assets [Line Items]
Square footage of office space (in square feet) | ft²	6,000
Annual base rent	$ 50,000
Operating lease term		2 years
Lease expiration date		Nov. 30, 2020
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		$ 500,000
Letter of credit [Abstract]
Minimum letter of credit amount required to be maintained under lease agreement			$ 100,000
Expiration date of letter of credit		Feb. 28, 2021
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		$ 200,000
Operating lease term		10 years

X

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Minimum letter of credit amount required to be maintained under lease agreement.

+ References

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Term of leasing arrangements under operating leases.

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Area of a real estate property.

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- Definition

Date which lease or group of leases is set to expire, in CCYY-MM-DD format.

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- Definition

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

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-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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

This element represents the payments that the lessee is obligated to make or can be required to make in connection with a property under the terms of an agreement classified as an operating lease, excluding contingent rentals and a guarantee by the lessee of the lessor's debt and the lessee's obligation to pay (apart from the rental payments) executory costs such as insurance, maintenance, and taxes.

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Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

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