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Income Taxes - Summary of Change in Valuation Allowance (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |
Beginning balance | $ 5,972 | $ 7,094
Charged to costs and expenses | 6,323 | (1,423)
Charged to retained earnings | (834) |
Charged to other comprehensive income | (97) | 301
Ending balance | $ 11,364 | $ 5,972

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- Definition Valuation allowance deferred tax asset change in amount charged to costs and expenses. + References No definition available. + Details
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Namespace Prefix: | dcth_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Valuation allowance deferred tax asset change in amount charged to other comprehensive income. + References No definition available. + Details
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Namespace Prefix: | dcth_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Valuation allowance deferred tax asset change in amount charged to retained earnings. + References No definition available. + Details
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Namespace Prefix: | dcth_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Period Type: | duration