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COMPENSATION ARRANGEMENTS (Tables) | 12 Months Ended
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Dec. 31, 2021
Share-based Payment Arrangement [Abstract] |
Schedule of Stock-Based Compensation Expense | The stock-based compensation expense related to stock awards issued under the Plans and acquisition-related awards are presented within the following line items of the consolidated statements of operations for the years ended December 31, 2021, 2020 and 2019 (in thousands):
| Year Ended December 31,
| 2021 |  | 2020 |  | 2019
Cost of revenue | $ | 585 |  |  | $ | 662 |  |  | $ | 1,482 |
Marketing | 748 |  |  | 1,522 |  |  | 5,809 |
Selling, general and administrative | 31,836 |  |  | 36,826 |  |  | 74,324 |
Restructuring and related charges | — |  |  | 1,735 |  |  | — |
Total stock-based compensation expense | $ | 33,169 |  |  | $ | 40,745 |  |  | $ | 81,615 |
We capitalized $3.7 million, $4.5 million and $7.1 million of stock-based compensation for the years ended December 31, 2021, 2020 and 2019, in connection with internally-developed software and cloud computing arrangements.
Schedule of Restricted Stock Unit Activity | The table below summarizes restricted stock unit activity under the Plans for the year ended December 31, 2021:
| Restricted Stock Units |  | Weighted- Average Grant Date Fair Value (per share)
Unvested at December 31, 2020 | 1,853,007 |  |  | $ | 31.91 |
Granted | 2,150,963 |  |  | 31.48 |
Vested | (1,229,689) |  |  | 30.26 |
Forfeited | (569,046) |  |  | 36.69 |
Unvested at December 31, 2021 | 2,205,235 |  |  | $ | 31.06 |
Share-based Payment Arrangement, Performance Shares, Outstanding Activity | The table below summarizes Performance Share Unit activity under the Plans for the year ended December 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 | (90,006) |  |  | 26.46 |  |  | — |  |  | — |
Forfeited | (38,669) |  |  | 23.24 |  |  | — |  |  | — |
Unvested at December 31, 2021 | 37,763 |  |  | $ | 28.39 |  |  | 57,668 |  |  | $ | — |
Maximum shares issuable upon vesting at December 31, 2021 | 37,763 |  |  |  |  | 57,668 |  |  |
(1) Performance Share Units granted during the year ended December 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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- 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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