Deferred Revenue of Membership Upgrade Sales and Deferred Commission Expense - Schedule of Change in Deferred Revenue and Deferred Commissions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Movement in Deferred Revenue
Revenue recognized from membership upgrade sales upfront payments	$ (12,958)	$ (11,191)	$ (9,675)
Net increase in deferred revenue - upfront payments from membership grade sales	33,946	36,935	22,954
Movement in Deferred Costs
Deferred commission expense as of December 31,	47,349	42,471
Deferred commission expense	7,193	8,657
Commission expense recognized	(4,101)	(3,779)
Net increase in deferred commission expense	3,092	4,878
Deferred commission expense as of December 31,	50,441	47,349	42,471
Membership Subscriptions
Movement in Deferred Revenue
Deferred revenue - upfront payments from membership upgrade sales as of December 31,	163,957	138,878
Membership upgrade sales current period, gross	34,661	36,270
Revenue recognized from membership upgrade sales upfront payments	(12,958)	(11,191)
Net increase in deferred revenue - upfront payments from membership grade sales	21,703	25,079
Deferred revenue - upfront payments from membership upgrade sales as of December 31,	$ 185,660	$ 163,957	$ 138,878