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REVENUE - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	$ 115,661	$ 81,220
Transferred over Time | Subscription
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	86,185	58,010
Transferred over Time | Advertising
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	11,635	11,748
Transferred over Time | Duolingo English Test
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	9,972	8,080
Transferred over Time | Other
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	$ 7,869	$ 3,382

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

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