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STOCK-BASED COMPENSATION - Schedule of non-cash compensation expense related to equity awards (Details ) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Non-cash compensation expense related to equity awards |  |  |  |
Total non-cash compensation | $ 17,074 | $ 14,161 | $ 51,804 | $ 39,236
Cost of revenue |  |  |  |
Non-cash compensation expense related to equity awards |  |  |  |
Total non-cash compensation | 371 | 372 | 1,231 | 947
Selling and marketing expense |  |  |  |
Non-cash compensation expense related to equity awards |  |  |  |
Total non-cash compensation | 1,805 | 1,678 | 5,583 | 4,431
General and administrative expense |  |  |  |
Non-cash compensation expense related to equity awards |  |  |  |
Total non-cash compensation | 13,233 | 10,356 | 38,658 | 29,208
Product development |  |  |  |
Non-cash compensation expense related to equity awards |  |  |  |
Total non-cash compensation | $ 1,665 | $ 1,755 | $ 6,332 | $ 4,650

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