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Income Taxes - Summary of Change in Valuation (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Income Tax Disclosure [Abstract] |  |
Beginning balance | $ 21,332 | $ 14,793
Charged to costs and expenses | 2,114 | 6,281
Charged to other comprehensive income | (321) | 258
Ending balance | $ 23,125 | $ 21,332

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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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- 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_
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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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32537-109319 + Details
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- References No definition available. + Details
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