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INCOME TAXES - Valuation Allowance (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Deferred Tax Assets, Valuation Allowance [Roll Forward] |  |
Beginning balance | $ (156,870) | $ (108,504)
Valuation allowances established | (99,858) | (48,366)
Release of valuation allowances | 0 | 0
Ending balance | $ (256,728) | $ (156,870)

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- Definition Deferred Tax Asset, Valuation Allowance, Additions + References No definition available. + Details
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Balance Type: | credit
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- Definition Deferred Tax Asset, Valuation Allowance, Released + References No definition available. + Details
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Namespace Prefix: | duol_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Deferred Tax Assets, Valuation Allowance + References No definition available. + Details
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Namespace Prefix: | duol_
Data Type: | xbrli:stringItemType
Balance Type: | na
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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 -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-2 + Details
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