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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | $ 140,422 | $ 97,118 | $ 401,647 | $ 254,857
Related party revenue | 245 | 1,041 | 864 | 2,479
Total net revenue | 140,667 | 98,159 | 402,511 | 257,336
United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net revenue | 139,998 | 97,369 | 400,871 | 255,142
International |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net revenue | 669 | 790 | 1,640 | 2,194
Lifetime subscriptions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net revenue | 50,862 | 35,005 | 140,893 | 97,093
Term subscriptions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net revenue | 88,970 | 60,759 | 257,470 | 154,593
Non-subscription revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net revenue | 835 | 2,395 | 4,148 | 5,650
Transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Related party revenue | 0 | 0 | 0 | 0
Total net revenue | 139,831 | 95,763 | 398,362 | 251,685
Transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net revenue | 836 | 2,396 | 4,149 | 5,651
Subscriptions |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 139,831 | 95,763 | 398,362 | 251,685
Subscriptions | Transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 139,831 | 95,763 | 398,362 | 251,685
Subscriptions | Transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 0 | 0 | 0 | 0
Advertising |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 423 | 437 | 1,968 | 1,443
Advertising | Transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 0 | 0 | 0 | 0
Advertising | Transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 423 | 437 | 1,968 | 1,443
Revenue Share (Third-party) |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 168 | 918 | 1,317 | 1,729
Revenue Share (Third-party) | Transferred over time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | 0 | 0 | 0 | 0
Revenue Share (Third-party) | Transferred at a point in time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net revenue | $ 168 | $ 918 | $ 1,317 | $ 1,729

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