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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Movement in Deferred Revenue |  |  |
Revenue recognized from membership upgrade sales upfront payments | $ (11,191) | $ (9,675) | $ (8,660)
Net increase in deferred revenue - upfront payments from membership grade sales | 36,935 | 22,954 | 19,655
Movement in Deferred Costs |  |  |
Deferred commission expense as of December 31 | 42,471 | 41,149 |
Deferred commission expense | 8,657 | 4,995 |
Commission expense recognized | (3,779) | (3,673) |
Net increase in deferred commission expense | 4,878 | 1,322 |
Deferred commission expense as of December 31, | 47,349 | 42,471 | 41,149
Membership Subscriptions |  |  |
Movement in Deferred Revenue |  |  |
Deferred revenue - upfront payments from membership upgrade sales as of December 31, | 138,878 | 126,814 |
Membership upgrade sales current period, gross | 36,270 | 21,739 |
Revenue recognized from membership upgrade sales upfront payments | (11,191) | (9,675) |
Net increase in deferred revenue - upfront payments from membership grade sales | 25,079 | 12,064 |
Deferred revenue - upfront payments from membership upgrade sales as of December 31, | $ 163,957 | $ 138,878 | $ 126,814

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