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STOCK-BASED COMPENSATION - Summary of Stock-Based Compensation Expense Associated with Each Type of Award (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total stock-based compensation expense | $ 14,844 | $ 7,515
Stock options, RSUs, and PSUs |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total stock-based compensation expense | 13,840 | 7,077
Employee stock purchase plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total stock-based compensation expense | $ 1,004 | $ 438

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