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STOCK-BASED COMPENSATION - Schedule of non-cash compensation expense related to equity awards (Details ) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Non-cash compensation expense related to equity awards |  |
Total non-cash compensation | $ 16,436 | $ 11,917
Cost of revenue |  |
Non-cash compensation expense related to equity awards |  |
Total non-cash compensation | 397 | 242
Selling and marketing expense |  |
Non-cash compensation expense related to equity awards |  |
Total non-cash compensation | 1,802 | 1,156
General and administrative expense |  |
Non-cash compensation expense related to equity awards |  |
Total non-cash compensation | 12,171 | 9,123
Product development |  |
Non-cash compensation expense related to equity awards |  |
Total non-cash compensation | $ 2,066 | $ 1,396

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