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Acquisition - Narrative (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended			12 Months Ended
	Jan. 13, 2022	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Business Acquisition [Line Items]
Business acquisition settled					$ 401,125	$ 7,891
Gain on foreign currency remeasurement of purchase consideration		$ 0	$ 0		4,628	0
Busuu Online S.L.
Business Acquisition [Line Items]
Ownership percent of stock acquired	100.00%
Acquisition related costs					600		$ 5,300
Fair value of purchase consideration	$ 417,000
Business acquisition settled	421,700
Gain on foreign currency remeasurement of purchase consideration	4,600
Potential additional payments, subject to performance-based contingencies	$ 25,500
Contingent consideration, liability		3,600		$ 3,600	3,600
Net revenues				19,700
Net loss				$ 19,500
Pro forma revenue		194,800	208,700		397,700	417,300
Pro forma net income (loss)		$ 8,200	$ 22,400		$ 13,600	$ (51,700)

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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