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Deferred Revenue of Membership Upgrade Sales and Deferred Commission Expense
 12 Months Ended
Dec. 31, 2023
Revenue from Contract with Customer [Abstract]  
Deferred Revenue of Membership Upgrade Sales and Deferred Commission Expense Deferred Revenue of Membership Upgrade Sales and Deferred Commission Expense
The components of the change in deferred revenue entry of membership subscriptions and deferred commission expense were as follows:
As of
(amounts in thousands)
20232022
Deferred revenue - upfront payments from membership upgrade sales as of December 31,$185,660 $163,957 
Membership upgrade sales35,684 34,661 
Revenue recognized from membership upgrade sales upfront payments(14,719)(12,958)
Net increase in deferred revenue - upfront payments from membership upgrade sales20,965 21,703 
Deferred revenue - upfront payments from membership upgrade sales as of December 31, (1)
$206,625 $185,660 
Deferred commission expense as of December 31,$50,441 $47,349 
Deferred commission expense7,411 7,193 
Commission expense recognized(4,211)(4,101)
Net increase in deferred commission expense3,200 3,092 
Deferred commission expense as of December 31,$53,641 $50,441 
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(1)Included in Deferred membership revenue on the Consolidated Balance Sheet.