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COMPENSATION ARRANGEMENTS (Tables)
12 Months Ended
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,
202020192018
Cost of revenue $662 $1,482 $1,485 
Marketing1,522 5,809 6,948 
Selling, general and administrative36,826 74,324 56,288 
Restructuring and related charges1,735 — — 
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 UnitsWeighted- Average Grant Date Fair Value (per share)
Unvested at December 31, 2019$1,527,014 $74.80 
Granted1,836,665 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 UnitsWeighted-Average Grant Date Fair Value (per unit)Market-based Performance Share UnitsWeighted-Average Grant Date Fair Value (per unit)
Unvested at December 31, 2019203,853 $79.76 341,002 $60.60 
Granted96,598 15.44 — — 
Vested(104,441)80.77 — — 
Forfeited(71,301)79.91 (283,334)60.60 
Unvested at December 31, 2020124,709 $29.73 57,668 $60.60 
Maximum shares issuable upon vesting at December 31, 2020
173,008 57,668