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STOCKHOLDERS' EQUITY AND COMPENSATION ARRANGEMENTS (Tables)
6 Months Ended
Jun. 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 six months ended June 30, 2021 and 2020 (in thousands):
Three Months Ended June 30, Six Months Ended June 30,
2021202020212020
Cost of revenue $190 $81 $361 $340 
Marketing178 (33)313 841 
Selling, general and administrative9,370 8,495 16,243 21,377 
Restructuring and related charges— 1,424 — 1,424 
Total stock-based compensation expense $9,738 $9,967 $16,917 $23,982 
Schedule of Restricted Stock Unit Activity
The table below summarizes restricted stock unit activity under the Plans for the six months ended June 30, 2021:
Restricted Stock UnitsWeighted-Average Grant Date Fair Value (per unit)
Unvested at December 31, 20201,853,007 $31.91 
Granted901,603 43.07 
Vested(929,616)28.47 
Forfeited(193,507)36.09 
Unvested at June 30, 20211,631,487 $39.38 
Schedule of Performance and Market-based Performance Share Unit Activity
The table below summarizes Performance Share Unit activity under the Plans for the six months ended June 30, 2021:
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, 2020124,709 $29.73 57,668 $60.60 
Granted (1)
41,729 15.44 — — 
Vested(86,710)24.36 — — 
Forfeited(282)69.00 — — 
Unvested at June 30, 202179,446 27.95 57,668 60.60 
Maximum shares issuable upon vesting at June 30, 2021
79,446 57,668 
(1)Performance Share Units granted during the six months ended June 30, 2021 relate to the issuance of incremental shares upon the Compensation Committee's certification of the achievement of the 2020 performance metrics.