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INTANGIBLE ASSETS AND GOODWILL - Narrative (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]
Capitalized software development costs	$ 4,328	$ 6,700
Goodwill, tax deductible amount	$ 6,668		$ 6,923

X

- Definition

Goodwill, Tax Deductible Amount

+ References

No definition available.

+ Details

Name:	duol_GoodwillTaxDeductibleAmount
Namespace Prefix:	duol_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Additions made to capitalized computer software costs during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 985
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481283/985-20-50-2

+ Details

Name:	us-gaap_CapitalizedComputerSoftwareAdditions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration