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Acquisition - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Jan. 13, 2022
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2022
Sep. 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   5,300   $ 5,300 5,300    
Net revenues       29,000      
Net loss       $ 28,700      
Pro forma revenue   164,700 184,200   562,400 601,500  
Pro forma net income (loss)   $ 253,600 $ (3,900)   $ 267,300 $ (55,600)