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STOCKHOLDERS' EQUITY AND COMPENSATION ARRANGEMENTS - Stock-based Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense | $ 8,204 | $ 8,690 | $ 25,121 | $ 32,672
Capitalized amount of stock-based compensation | 900 | 1,100 | 2,900 | 3,400
Cost of revenue |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense | 137 | 156 | 498 | 496
Marketing |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense | 173 | 377 | 486 | 1,218
Selling, general and administrative |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense | 7,894 | 7,846 | 24,137 | 29,223
Restructuring and related charges |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense | $ 0 | $ 311 | $ 0 | $ 1,735

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