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Deferred Revenue of Membership Upgrade Sales and Deferred Commission Expense (Tables) | 12 Months Ended
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Dec. 31, 2019
Revenue from Contract with Customer [Abstract] |
Deferred Revenue, by Arrangement, Disclosure | The components of the change in deferred revenue entry of membership subscriptions and deferred commission expense were as follows:
|  | As of
(amounts in thousands) |  | 2019 |  | 2018
Deferred revenue - upfront payments from membership upgrade sales as of December 31, |  | $ | 116,363 |  |  | $ | 85,596 |
Cumulative effect of change in accounting principle (1) |  | — |  |  | 23,387 |
Deferred revenue - upfront payments from membership subscriptions as of January 1, |  | 116,363 |  |  | 108,983 |
Membership upgrade sales current period, gross |  | 19,111 |  |  | 15,191 |
Revenue recognized from membership upgrade sales upfront payments |  | (8,660 | ) |  | (7,811 | )
Net increase in deferred revenue - upfront payments from membership grade sales |  | 10,451 |  |  | 7,380 |
Deferred revenue - upfront payments from membership upgrade sales as of December 31, |  | $ | 126,814 |  |  | $ | 116,363 |
Deferred commission expense as of December 31 |  | $ | 40,308 |  |  | $ | 31,443 |
Cumulative effect of change in accounting principle (1) |  | — |  |  | 8,200 |
Deferred commission expense as of January 1, |  | 40,308 |  |  | 39,643 |
Deferred commission expense |  | 4,508 |  |  | 4,274 |
Commission expense recognized |  | (3,667 | ) |  | (3,609 | )
Net increase in deferred commission expense |  | 841 |  |  | 665 |
Deferred commission expense as of December 31, |  | $ | 41,149 |  |  | $ | 40,308 |
_____________________ (1) The cumulative effect adjustments resulting from the adoption of ASU 2014-09 as of January 1, 2018.

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- Definition Tabular disclosure of contract balances and changes in contract balances. + 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=118956577&loc=SL49130551-203045 + Details
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