XML 148 R57.htm IDEA: XBRL DOCUMENT
v3.24.0.1

INCOME TAXES - Valuation Allowance (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Deferred Tax Assets, Valuation Allowance [Roll Forward] |  |
Beginning balance | $ (108,504) | $ (76,293)
Valuation allowances established | (48,366) | (32,211)
Release of valuation allowances | 0 | 0
Ending balance | $ (156,870) | $ (108,504)

X
- Definition Deferred Tax Asset, Valuation Allowance, Additions + References No definition available. + Details
Name: | duol_DeferredTaxAssetValuationAllowanceAdditions
Namespace Prefix: | duol_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Deferred Tax Asset, Valuation Allowance, Released + References No definition available. + Details
Name: | duol_DeferredTaxAssetValuationAllowanceReleased
Namespace Prefix: | duol_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Deferred Tax Assets, Valuation Allowance + References No definition available. + Details
Name: | duol_DeferredTaxAssetsValuationAllowanceRollForward
Namespace Prefix: | duol_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_DeferredTaxAssetsValuationAllowance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant