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COMPENSATION ARRANGEMENTS - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Apr. 30, 2019 | Apr. 30, 2010 | Jan. 31, 2008
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of shares available for future issuance (in shares) | 2,055,180 |  |  |  |  |
Total stock-based compensation expense | $ 33,169 | $ 40,745 | $ 81,615 |  |  |
Share-based payment arrangement, amount capitalized | $ 3,700 | 4,500 | 7,100 |  |  |
Number of shares available for grant (in shares) | 100,500,000 |  |  |  |  |
United States |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Defined contribution plan, employer matching contribution, percent of match | 50.00% |  |  |  |  |
Defined contribution plan, employer matching contribution, percent of employees' eligible compensation | 6.00% |  |  |  |  |
Defined contribution plan, vesting period | 3 years |  |  |  |  |
Defined contribution plan, cost | $ 6,700 | $ 6,600 | $ 9,400 |  |  |
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) | 49,399 | 69,371 | 74,300 |  |  |
Restricted stock units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Awards granted in period, weighted average grant date fair value (in usd per shares) | $ 31.48 | $ 24.92 | $ 68.80 |  |  |
Fair value of restricted stock award vested | $ 48,800 | $ 19,200 | $ 43,800 |  |  |
Unrecognized compensation costs, amount | $ 49,900 |  |  |  |  |
Unrecognized compensation costs, period for recognition | 1 year 1 month 9 days |  |  |  |  |
Restricted stock units | Minimum |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting period | 1 year |  |  |  |  |
Restricted stock units | Maximum |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting period | 4 years |  |  |  |  |
Market-based Performance Share Units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Awards granted in period, weighted average grant date fair value (in usd per shares) | $ 0 |  |  |  |  |
Award vesting trigger stock price (in USD per share) | $ 120.00 |  |  |  |  |
Award vesting term, umber of consecutive trading days | 30 days |  |  |  |  |
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] |  |  |  |  |  |
Awards granted in period, weighted average grant date fair value (in usd per shares) | $ 15.44 |  |  |  |  |
Unrecognized compensation costs, amount | $ 100 |  |  |  |  |
Unrecognized compensation costs, period for recognition | 11 months 26 days |  |  |  |  |
Cost of revenue |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Total stock-based compensation expense | $ 585 | 662 | 1,482 |  |  |
Marketing |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Total stock-based compensation expense | 748 | 1,522 | 5,809 |  |  |
Selling, general and administrative |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Total stock-based compensation expense | 31,836 | 36,826 | 74,324 |  |  |
Restructuring and related charges |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Total stock-based compensation expense | $ 0 | $ 1,735 | $ 0 |  |  |
2008 Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of shares authorized for awards (in shares) |  |  |  |  |  | 3,230,925
2010 Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of shares authorized for awards (in shares) |  |  |  |  | 1,000,000 |
2011 Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of shares authorized for awards (in shares) |  |  |  | 9,375,000 |  |

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