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STOCK-BASED COMPENSATION - Summary of Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |
Total stock-based compensation before tax | $ 30,100 | $ 23,175
Income tax benefit | (5,991) | (4,582)
Cost of revenue |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |
Total stock-based compensation before tax | 5,925 | 5,152
Selling and marketing |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |
Total stock-based compensation before tax | 13,720 | 9,718
Research and development |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |
Total stock-based compensation before tax | 6,770 | 5,496
General and administrative |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |
Total stock-based compensation before tax | $ 3,685 | $ 2,809

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