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

No definition available.

Name:	dcth_AdditionalSquareFootageOfOfficeSpaceLeasedUnderExerciseOfOptionRight
Namespace Prefix:	dcth_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

- Definition

Minimum number of days, prior to expiration of the lease term, that option to purchase notice, on the Facility, must be delivered to the Landlord.

+ References

No definition available.

+ Details

Name:	dcth_DeliveryTimeFrameOfWrittenNoticeMinimum
Namespace Prefix:	dcth_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

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).

+ References

No definition available.

+ Details

Name:	dcth_ExpansionOptionAdditionalSquareFootageOfOfficeSpace
Namespace Prefix:	dcth_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	dcth_LetterOfCreditAbstract
Namespace Prefix:	dcth_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

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

+ References

No definition available.

+ Details

Name:	dcth_MinimumLetterOfCreditAmountRequiredToBeMaintained
Namespace Prefix:	dcth_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	dcth_OperatingLeasesAbstract
Namespace Prefix:	dcth_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The purchase price of the operating leased asset if it is acquired by expiration date.

+ References

No definition available.

+ Details

Name:	dcth_OperatingLeasesPurchasePriceIfAcquiredByExpiration
Namespace Prefix:	dcth_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Term of leasing arrangements under operating leases.

+ References

No definition available.

+ Details

Name:	dcth_OperatingLeasesTerm
Namespace Prefix:	dcth_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of rent expenses related to restructuring charges.

+ References

No definition available.

+ Details

Name:	dcth_RentExpenseRelatedToRestructuringCharges
Namespace Prefix:	dcth_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Area of a real estate property.

+ References

No definition available.

+ Details

Name:	us-gaap_AreaOfRealEstateProperty
Namespace Prefix:	us-gaap_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant

- Definition

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

+ References

No definition available.

+ Details

Name:	us-gaap_LeaseExpirationDate1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

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

+ References

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))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

Name:	us-gaap_LineOfCreditFacilityExpirationDate1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 50

-Paragraph 2

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 10

-Section 55

-Paragraph 40

-Subparagraph (Note 3)

-URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697

+ Details

Name:	us-gaap_OperatingLeasesFutureMinimumPaymentsDue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_OperatingLeasesFutureMinimumPaymentsDueAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

+ Details

Name:	us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

+ Details

Name:	us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

+ Details

Name:	us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

+ Details

Name:	us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

+ Details

Name:	us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 10

-Section 55

-Paragraph 40

-Subparagraph (Note 3)

-URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 10

-Section 25

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=7661868&loc=d3e34039-112682

+ Details

Name:	us-gaap_OperatingLeasesRentExpenseMinimumRentals
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

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

+ References

+ Details

Name:	us-gaap_OperatingLeasesRentExpenseNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Commitments (Details)	12 Months Ended				12 Months Ended																			12 Months Ended
Commitments (Details)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2014 Office Space in New York, New York, Initial Lease [Member] sqft	Dec. 31, 2014 Office Space in New York, New York, Lease Amendment [Member] sqft	Dec. 31, 2014 Office Space in New York, New York, Initial Lease and Lease Amendment [Member] Year 1 [Member] USD ($)	Dec. 31, 2014 Office Space in New York, New York, Initial Lease and Lease Amendment [Member] Year 2 [Member] USD ($)	Dec. 31, 2014 Office Space in New York, New York, Initial Lease and Lease Amendment [Member] Year 3 [Member] USD ($)	Dec. 31, 2014 Office Space in New York, New York, Initial Lease and Lease Amendment [Member] Year 4 [Member] USD ($)	Dec. 31, 2014 Office Space in New York, New York, Initial Lease and Lease Amendment [Member] Year 5 [Member] USD ($)	Dec. 31, 2014 Office Space in New York, New York, Initial Lease and Lease Amendment [Member] Years Thereafter [Member] USD ($)	Dec. 31, 2014 Delcath's European Headquarters Lease Agreement [Member] sqft	Dec. 31, 2014 Delcath's European Headquarters Lease Agreement [Member] Year 1 [Member] USD ($)	Dec. 31, 2014 Delcath's European Headquarters Lease Agreement [Member] Year 1 [Member] EUR (€)	Dec. 31, 2014 Delcath's European Headquarters Lease Agreement [Member] Year 2 [Member] USD ($)	Dec. 31, 2014 Delcath's European Headquarters Lease Agreement [Member] Year 2 [Member] EUR (€)	Dec. 31, 2014 Delcath's European Headquarters Lease Agreement [Member] Year 3 [Member] USD ($)	Dec. 31, 2014 Delcath's European Headquarters Lease Agreement [Member] Year 3 [Member] EUR (€)	Dec. 31, 2014 Delcath's European Headquarters Lease Agreement [Member] Year 4 [Member] USD ($)	Dec. 31, 2014 Delcath's European Headquarters Lease Agreement [Member] Year 4 [Member] EUR (€)	Dec. 31, 2014 Delcath's European Headquarters Lease Agreement [Member] Year 5 [Member] USD ($)	Dec. 31, 2014 Delcath's European Headquarters Lease Agreement [Member] Year 5 [Member] EUR (€)	Dec. 31, 2014 Facility Lease Agreement [Member] USD ($) sqft	Dec. 31, 2014 Country Club Road Lease Agreement [Member] USD ($) sqft	Dec. 31, 2014 Office Space at 1301 Avenue of the Americas, New York, New York [Member] USD ($) sqft	Dec. 31, 2014 Park Road Lease Agreement [Member] USD ($) sqft
Operating Leases [Abstract]
Square footage of office space (in square feet)				8,629								19,200											10,320	18,000	5,818	6,000
Expansion option, additional square footage of office space (in square feet)				8,629
Additional square footage of office space leased under exercise of option right (in square feet)					8,629
Lease expiration date					Mar. 31, 2021																				May 20, 2016
Future minimum lease payments under all operating leases [Abstract]
2015	$ 869,000
2016	426,000
2017	252,000
2018	260,000
2019	239,000
Total future minimum payments due	2,046,000
Operating lease term												10 years												3 years		1 year
Annual base rent						961,000	970,000	996,000	996,000	1,000,000	1,100,000		128,322	106,051	163,319	134,974	192,483	159,077	221,647	183,179	221,647	183,179		216,000	200,000	45,900
Delivery time frame of written notice, minimum												6 months
Purchase price which commenced on September 1, 2009																							440,000
Rent expense	2,300,000us-gaap_OperatingLeasesRentExpenseNet	1,500,000us-gaap_OperatingLeasesRentExpenseNet	1,500,000us-gaap_OperatingLeasesRentExpenseNet
Rent expense related to restructuring charges	1,300,000
Letter of credit [Abstract]
Minimum letter of credit amount required to be maintained under lease agreement	$ 881,297																								$ 200,000
Expiration date of letter of credit	Feb. 01, 2016