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Deferred Revenue of Membership Upgrade Sales and Deferred Commission Expense (Tables) | 12 Months Ended
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Dec. 31, 2021
Revenue from Contract with Customer [Abstract] |
Schedule of Change in Deferred Revenue and Deferred Commissions | The components of the change in deferred revenue entry of membership subscriptions and deferred commission expense were as follows:
|  | As of
(amounts in thousands) |  | 2021 |  | 2020
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, (a) |  | $ | 163,957 |  |  | $ | 138,878 |
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 |
_____________________ (a)Included in Deferred membership revenue on the Consolidated Balance Sheet.

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- Definition Tabular disclosure of receivable, contract asset, and contract liability from contract with customer. Includes, but is not limited to, change in contract asset and contract liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130551-203045 + Details
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