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COMPENSATION ARRANGEMENTS (Tables) | 12 Months Ended
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Dec. 31, 2020
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, 2020, 2019 and 2018 (in thousands):
| Year Ended December 31,
| 2020 |  | 2019 |  | 2018
Cost of revenue | $ | 662 |  |  | $ | 1,482 |  |  | $ | 1,485 |
Marketing | 1,522 |  |  | 5,809 |  |  | 6,948 |
Selling, general and administrative | 36,826 |  |  | 74,324 |  |  | 56,288 |
Restructuring and related charges | 1,735 |  |  | — |  |  | — |
Other income (expense), net | — |  |  | — |  |  | 100 |
Total stock-based compensation expense | $ | 40,745 |  |  | $ | 81,615 |  |  | $ | 64,821 |
We capitalized $4.5 million, $7.1 million and $7.4 million of stock-based compensation for the years ended December 31, 2020, 2019 and 2018, 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, 2020:
| Restricted Stock Units |  | Weighted- Average Grant Date Fair Value (per share)
Unvested at December 31, 2019 | $ | 1,527,014 |  |  | $ | 74.80 |
Granted | 1,836,665 |  |  | 24.92 |
Vested | (679,944) |  |  | 72.25 |
Forfeited | (830,728) |  |  | 62.48 |
Unvested at December 31, 2020 | $ | 1,853,007 |  |  | $ | 31.91 |
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, 2020:
| 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, 2019 | 203,853 |  |  | $ | 79.76 |  |  | 341,002 |  |  | $ | 60.60 |
Granted | 96,598 |  |  | 15.44 |  |  | — |  |  | — |
Vested | (104,441) |  |  | 80.77 |  |  | — |  |  | — |
Forfeited | (71,301) |  |  | 79.91 |  |  | (283,334) |  |  | 60.60 |
Unvested at December 31, 2020 | 124,709 |  |  | $ | 29.73 |  |  | 57,668 |  |  | $ | 60.60 |
Maximum shares issuable upon vesting at December 31, 2020 | 173,008 |  |  |  |  | 57,668 |  |  |

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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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