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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 Liability for Customer Credits | The following table summarizes the activity in the liability for customer credits for the years ended December 31, 2020 and 2019 (in thousands):
| Customer Credits
Balance as of December 31, 2018 | $ | 15,118 |
Credits issued | 115,031 |
Credits redeemed | (102,682) |
Breakage revenue recognized | (13,699) |
Foreign currency translation | (4) |
Balance as of December 31, 2019 | $ | 13,764 |
Credits issued | 213,826 |
Credits redeemed | (147,096) |
Breakage revenue recognized | (21,364) |
Foreign currency translation | 1,876 |
Balance as of December 31, 2020 | $ | 61,006 |
Schedule of Deferred Contract Acquisition Costs | Deferred contract acquisition costs are presented within the following line items of the consolidated balance sheets as of December 31, 2020 and 2019 (in thousands):
| December 31,
| 2020 |  | 2019
Prepaid expenses and other current assets | $ | 1,009 |  |  | $ | 2,501 |
Other non-current assets | 5,315 |  |  | 10,133 |
Schedule of Expected Credit Losses on Accounts Receivable | The following table summarizes the activity in the allowance for expected credit losses on accounts receivables for the year ended December 31, 2020 (in thousands):
| Allowance for Expected Credit Losses
Balance as of January 1, 2020 | $ | 3,693 |
Change in provision | 9,631 |
Write-offs | (3,315) |
Foreign currency translation | (253) |
Balance as of December 31, 2020 | $ | 9,756 |

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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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- Definition Tabular disclosure of the amounts paid in advance for capitalized costs that will be expensed with the passage of time or the occurrence of a triggering event, and will be charged against earnings within one year or the normal operating cycle, if longer; the aggregate carrying amount of current assets, not separately presented elsewhere in the balance sheet; and other deferred costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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