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Deferred Revenue of Membership Upgrade Sales and Deferred Commission Expense | 12 Months Ended
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Dec. 31, 2021
Revenue from Contract with Customer [Abstract] |
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) |  | 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 The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -URI http://asc.fasb.org/topic&trid=49130388 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -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 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130556-203045 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130554-203045 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130550-203045 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130554-203045 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130554-203045 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130554-203045 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130558-203045 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130554-203045 + Details
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