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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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