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STOCK-BASED COMPENSATION - Schedule of non-cash compensation expense related to equity awards (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Total non-cash compensation | $ 68,555 | $ 53,733 | $ 52,167
Cost of revenue |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Total non-cash compensation | 1,639 | 1,319 | 755
Selling and marketing expense |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Total non-cash compensation | 7,480 | 6,240 | 5,785
General and administrative expense |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Total non-cash compensation | 50,989 | 39,650 | 39,177
Product development |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Total non-cash compensation | $ 8,447 | $ 6,524 | $ 6,450

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