Number Of Subleases

No definition available.

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Namespace Prefix:	dcth_
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Period Type:	duration

- Definition

Discloses the amount charged against the accrued restructuring reserves, or earnings if not previously accrued, during the period for the specified type of restructuring cost.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 5.P.4(b))
-URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

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.

+ References

No definition available.

+ Details

Name:	us-gaap_RestructuringCostAndReserveLineItems
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Balance Type:	na
Period Type:	duration

- Definition

Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB TOPIC 5.P.4(b))
-URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

+ Details

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

- Details

Name:	us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis=us-gaap_PropertySubjectToOperatingLeaseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_AccruedLiabilitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BalanceSheetLocationAxis=us-gaap_OtherNoncurrentLiabilitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis=dcth_SubLease1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RestructuringCostAndReserveAxis=us-gaap_FacilityClosingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis=dcth_SubLease2Member
Namespace Prefix:
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Balance Type:
Period Type:

Restructuring Expenses - Additional Information (Detail) $ in Thousands			1 Months Ended		9 Months Ended	12 Months Ended
	Aug. 18, 2014 USD ($)	May 22, 2014 USD ($)	Aug. 18, 2014 USD ($)	May 22, 2014 USD ($)	Sep. 30, 2017 USD ($) Lease	Dec. 31, 2016 USD ($) Lease	Dec. 31, 2015 USD ($)
Lease Liability [Member]
Restructuring Cost And Reserve [Line Items]
Number of sub leases \| Lease					2	2
Restructuring reserve charges					$ 0	$ 0
Restructuring reserve balance					665	820	$ 1,039
Lease Liability [Member] \| Accrued Liabilities [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring reserve balance					300	200
Lease Liability [Member] \| Other Noncurrent Liabilities [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring reserve balance					$ 400	$ 600
Sub-lease 1 [Member] \| Facility Closing [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring reserve charges		$ 900		$ 900
Sub Lease 2 [Member] \| Facility Closing [Member]
Restructuring Cost And Reserve [Line Items]
Restructuring reserve charges	$ 700		$ 700