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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Disaggregation of Revenue [Line Items]    
Net revenue $ 136,620 $ 119,341
Related party revenue 178 373
Total net revenue 136,798 119,714
United States    
Disaggregation of Revenue [Line Items]    
Total net revenue 136,711 119,274
International    
Disaggregation of Revenue [Line Items]    
Total net revenue 87 440
Lifetime subscriptions    
Disaggregation of Revenue [Line Items]    
Total net revenue 51,452 40,164
Term subscriptions    
Disaggregation of Revenue [Line Items]    
Total net revenue 84,648 77,483
Non-subscription revenue    
Disaggregation of Revenue [Line Items]    
Total net revenue 698 2,067
Transferred over time    
Disaggregation of Revenue [Line Items]    
Related party revenue 0 0
Total net revenue 136,100 117,647
Transferred at a point in time    
Disaggregation of Revenue [Line Items]    
Related party revenue 178 373
Total net revenue 698 2,067
Subscriptions    
Disaggregation of Revenue [Line Items]    
Net revenue 136,100 117,647
Subscriptions | Transferred over time    
Disaggregation of Revenue [Line Items]    
Net revenue 136,100 117,647
Subscriptions | Transferred at a point in time    
Disaggregation of Revenue [Line Items]    
Net revenue 0 0
Advertising    
Disaggregation of Revenue [Line Items]    
Net revenue 277 910
Advertising | Transferred over time    
Disaggregation of Revenue [Line Items]    
Net revenue 0 0
Advertising | Transferred at a point in time    
Disaggregation of Revenue [Line Items]    
Net revenue 277 910
Revenue Share (Third-party)    
Disaggregation of Revenue [Line Items]    
Net revenue 243 784
Revenue Share (Third-party) | Transferred over time    
Disaggregation of Revenue [Line Items]    
Net revenue 0 0
Revenue Share (Third-party) | Transferred at a point in time    
Disaggregation of Revenue [Line Items]    
Net revenue $ 243 $ 784