XML 65 R38.htm IDEA: XBRL DOCUMENT
v3.25.0.1

DESCRIPTION OF THE BUSINESS AND BASIS OF PRESENTATION (Details) | Dec. 31, 2024 language
--- | ---
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Number of languages, more than | 40

X
- Definition Number Of Languages + References No definition available. + Details
Name: | duol_NumberOfLanguages
Namespace Prefix: | duol_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration