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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