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REVENUE - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	$ 230,743	$ 167,553
Subscription
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	190,987	131,688
Other
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	39,756	35,865
Advertising
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	17,882	12,952
Duolingo English Test
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	11,986	12,755
In-App Purchases
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	9,442	9,924
Other
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	$ 446	$ 234

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