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STOCKHOLDERS' EQUITY AND COMPENSATION ARRANGEMENTS (Tables) | 9 Months Ended
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Sep. 30, 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 and nine months ended September 30, 2021 and 2020 (in thousands):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Cost of revenue | $ | 137 |  |  | $ | 156 |  |  | $ | 498 |  |  | $ | 496 |
Marketing | 173 |  |  | 377 |  |  | 486 |  |  | 1,218 |
Selling, general and administrative | 7,894 |  |  | 7,846 |  |  | 24,137 |  |  | 29,223 |
Restructuring and related charges | — |  |  | 311 |  |  | — |  |  | 1,735 |
Total stock-based compensation expense | $ | 8,204 |  |  | $ | 8,690 |  |  | $ | 25,121 |  |  | $ | 32,672 |
Schedule of Restricted Stock Unit Activity | The table below summarizes restricted stock unit activity under the Plans for the nine months ended September 30, 2021:
| Restricted Stock Units |  | Weighted-Average Grant Date Fair Value (per unit)
Unvested at December 31, 2020 | 1,853,007 |  |  | $ | 31.91 |
Granted | 936,875 |  |  | 42.97 |
Vested | (1,002,467) |  |  | 29.34 |
Forfeited | (286,316) |  |  | 37.54 |
Unvested at September 30, 2021 | 1,501,099 |  |  | $ | 39.28 |
Schedule of Performance and Market-based Performance Share Unit Activity | The table below summarizes Performance Share Unit activity under the Plans for the nine months ended September 30, 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 | (768) |  |  | 69.00 |  |  | — |  |  | — |
Unvested at September 30, 2021 | 78,960 |  |  | 27.70 |  |  | 57,668 |  |  | 60.60 |
Maximum shares issuable upon vesting at September 30, 2021 | 78,960 |  |  |  |  | 57,668 |  |  |
(1)Performance Share Units granted during the nine months ended September 30, 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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- Definition Tabular disclosure of activity for award under share-based payment arrangement. Includes, but is not limited to, outstanding award at beginning and end of year, granted, exercised, forfeited, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average grant date fair value for outstanding performance shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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