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COMPENSATION ARRANGEMENTS - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Apr. 30, 2019 | Apr. 30, 2010 | Jan. 31, 2008
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Common stock, shares authorized (in shares) | 100,500,000 | 100,500,000 |  |  |  |
Number of shares available for future issuance (in shares) | 3,135,422 |  |  |  |  |
Total stock-based compensation expense | $ 40,745 | $ 81,615 | $ 64,821 |  |  |
Share-based payment arrangement, amount capitalized | $ 4,500 | 7,100 | 7,400 |  |  |
Number of shares available for grant (in shares) | 100,500,000 |  |  |  |  |
Cost of revenue |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Total stock-based compensation expense | $ 662 | 1,482 | 1,485 |  |  |
Marketing |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Total stock-based compensation expense | 1,522 | 5,809 | 6,948 |  |  |
Selling, general and administrative |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Total stock-based compensation expense | 36,826 | 74,324 | 56,288 |  |  |
Restructuring and related charges |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Total stock-based compensation expense | 1,735 | 0 | 0 |  |  |
Other income (expense), net |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Total stock-based compensation expense | $ 0 | $ 0 | $ 100 |  |  |
Employee Stock Purchase Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of shares available for grant (in shares) | 1,000,000 |  |  |  |  |
Shares issued under employee stock purchase plan (in shares) | 69,371 | 74,300 | 81,053 |  |  |
Restricted Stock Units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share-based compensation arrangement by share-based payment award, equity instruments other than options, grants in period, weighted average grant date fair value (in usd per shares) | $ 24.92 | $ 68.80 | $ 91.80 |  |  |
Stock issued during period, value, restricted stock award, gross | $ 19,200 | $ 43,800 | $ 64,100 |  |  |
Share-based payment arrangement, nonvested award, cost not yet recognized, amount | $ 38,800 |  |  |  |  |
Share-based payment arrangement, nonvested award, cost not yet recognized, period for recognition | 11 months 1 day |  |  |  |  |
Market-based Performance Share Units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share-based compensation arrangement by share-based payment award, equity instruments other than options, grants in period, weighted average grant date fair value (in usd per shares) | $ 0 |  |  |  |  |
Criteria for contingently issuable shares (in usd per share) | $ 120.00 |  |  |  |  |
Share-based compensation arrangement by share-based payment award, fair value assumptions, weighted average volatility rate | 49.80% |  |  |  |  |
Share-based compensation arrangement by share-based payment award, fair value assumptions, cost of equity rate | 12.80% |  |  |  |  |
Performance Share Units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share-based compensation arrangement by share-based payment award, equity instruments other than options, grants in period, weighted average grant date fair value (in usd per shares) | $ 15.44 |  |  |  |  |
Share-based payment arrangement, nonvested award, cost not yet recognized, amount | $ 1,300 |  |  |  |  |
Share-based payment arrangement, nonvested award, cost not yet recognized, period for recognition | 1 year 6 months 14 days |  |  |  |  |
Minimum | Restricted Stock Units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share-based compensation arrangement by share-based payment award, award vesting period | 1 year |  |  |  |  |
Maximum | Restricted Stock Units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share-based compensation arrangement by share-based payment award, award vesting period | 4 years |  |  |  |  |
2008 Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Common stock, shares authorized (in shares) |  |  |  |  |  | 3,230,925
2010 Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Common stock, shares authorized (in shares) |  |  |  |  | 1,000,000 |
2011 Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Common stock, shares authorized (in shares) |  |  |  | 9,375,000 |  |

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