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REVENUE RECOGNITION (Tables) | 12 Months Ended
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Dec. 31, 2020
Revenue From Contract With Customer [Abstract] |
Schedule of Assets and Liabilities Associated with Contracts from Customers | The following table provides information about assets and liabilities associated with our contracts from customers (in thousands):
|  | As of December 31, 2020 |
Accounts receivable |  | $ | 82,261 |
Short-term unbilled receivables |  |  | 6,659 |
Long-term unbilled receivables |  |  | 3,770 |
Short-term deferred revenue |  |  | 105,215 |
Long-term deferred revenue |  |  | 57,086 |
Summary of Significant Changes in Unbilled Receivables and Deferred Liabilities Balances | Significant changes in the unbilled receivables and deferred liabilities balances for the years ended December 31, 2020 and 2019, are as follows (in thousands):
|  | Year Ended December 31, 2020 |
|  | Unbilled Receivables |  |  | Deferred Revenue |
Balance at December 31, 2019 |  | $ | 1,362 |  |  | $ | (144,862 | )
Revenue recognized that was previously included in deferred revenue |  |  | — |  |  |  | 157,704 |
Increases due to cash received |  |  | — |  |  |  | (192,369 | )
Cumulative catch-up adjustment arising from changes in estimates of transaction price |  |  | — |  |  |  | 17,226 |
Unbilled receivables recognized |  |  | 9,067 |  |  |  | — |
Net change |  |  | 9,067 |  |  |  | (17,439 | )
Balance at December 31, 2020 |  | $ | 10,429 |  |  | $ | (162,301 | )
|  | Year Ended December 31, 2019 |
|  | Unbilled Receivables |  |  | Deferred Revenue |
Balance at December 31, 2018 |  | $ | 1,020 |  |  | $ | (122,567 | )
Revenue recognized that was previously included in deferred revenue |  |  | — |  |  |  | 133,394 |
Increases due to cash received |  |  | — |  |  |  | (157,321 | )
Cumulative catch-up adjustment arising from changes in estimates of transaction price |  |  | — |  |  |  | 1,632 |
Unbilled receivables recognized |  |  | 1,834 |  |  |  | — |
Transferred to receivables from unbilled receivables |  |  | (1,492 | ) |  |  | — |
Net change |  |  | 342 |  |  |  | (22,295 | )
Balance at December 31, 2019 |  | $ | 1,362 |  |  | $ | (144,862 | )

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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=121604090&loc=SL49130551-203045 + Details
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