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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 | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation expense | $ 15,312 | $ 12,300 | $ 30,156 | $ 19,815
Stock options, RSUs, and PSUs |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation expense | 14,361 | 11,557 | 28,201 | 18,634
Employee stock purchase plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation expense | $ 951 | $ 743 | $ 1,955 | $ 1,181

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