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STOCK-BASED COMPENSATION - Schedule of non-cash compensation expense related to equity awards (Details ) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Non-cash compensation expense related to equity awards |  |  |  |
Total non-cash compensation | $ 18,294 | $ 13,158 | $ 34,730 | $ 25,075
Cost of revenue |  |  |  |
Non-cash compensation expense related to equity awards |  |  |  |
Total non-cash compensation | 463 | 333 | 860 | 575
Selling and marketing expense |  |  |  |
Non-cash compensation expense related to equity awards |  |  |  |
Total non-cash compensation | 1,976 | 1,597 | 3,778 | 2,753
General and administrative expense |  |  |  |
Non-cash compensation expense related to equity awards |  |  |  |
Total non-cash compensation | 13,254 | 9,729 | 25,425 | 18,852
Product development |  |  |  |
Non-cash compensation expense related to equity awards |  |  |  |
Total non-cash compensation | $ 2,601 | $ 1,499 | $ 4,667 | $ 2,895

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