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STOCKHOLDERS' EQUITY AND COMPENSATION ARRANGEMENTS (Tables) | 3 Months Ended
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Mar. 31, 2021
Share-based Payment Arrangement [Abstract] |
Share-based Payment Arrangement, Activity | The stock-based compensation expense related to stock awards issued under the Plans are presented within the following line items of the condensed consolidated statements of operations for the three months ended March 31, 2021 and 2020 (in thousands):
| Three Months Ended March 31,
| 2021 |  | 2020
Cost of revenue | $ | 171 |  |  | $ | 259 |
Marketing | 135 |  |  | 874 |
Selling, general and administrative | 6,873 |  |  | 12,882 |
Total stock-based compensation expense | $ | 7,179 |  |  | $ | 14,015 |
Schedule of Restricted Stock Unit Activity | The table below summarizes restricted stock unit activity under the Plans for the three months ended March 31, 2021:
| Restricted Stock Units |  | Weighted-Average Grant Date Fair Value (per unit)
Unvested at December 31, 2020 | 1,853,007 |  |  | $ | 31.91 |
Granted | 129,827 |  |  | 32.87 |
Vested | (222,244) |  |  | 27.60 |
Forfeited | (125,053) |  |  | 32.39 |
Unvested at March 31, 2021 | 1,635,537 |  |  | $ | 32.37 |
Schedule of Performance and Market-based Performance Share Unit Activity | The table below summarizes Performance Share Unit activity under the Plans for the three months ended March 31, 2021:
| Performance Share Units |  | Weighted-Average Grant Date Fair Value (per unit) |  | Market-based Performance Share Units |  | Weighted-Average Grant Date Fair Value (per unit)
Unvested at December 31, 2020 | 124,709 |  |  | $ | 29.73 |  |  | 57,668 |  |  | $ | 60.60 |
Granted (1) | 41,729 |  |  | 15.44 |  |  | — |  |  | — |
Vested | (86,710) |  |  | 24.36 |  |  | — |  |  | — |
Forfeited | (282) |  |  | 69.00 |  |  | — |  |  | — |
Unvested at March 31, 2021 | 79,446 |  |  | 27.95 |  |  | 57,668 |  |  | 60.60 |
Maximum shares issuable upon vesting at March 31, 2021 | 79,446 |  |  |  |  | 57,668 |  |  |
(1)Performance Share Units granted during the three months ended March 31, 2021 relate to the issuance of incremental shares upon the Compensation Committee's certification of the achievement of the 2020 performance metrics.

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