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STOCKHOLDERS' EQUITY AND COMPENSATION ARRANGEMENTS Tables (Tables)
6 Months Ended
Jun. 30, 2020
Share-based Payment Arrangement [Abstract]  
Share-based Payment Arrangement, Activity
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 condensed consolidated statements of operations for the three and six months ended June 30, 2020 and 2019 (in thousands):

Three Months Ended June 30, Six Months Ended June 30,
2020201920202019
Cost of revenue $81  $380  $340  $758  
Marketing(33) 1,490  841  2,915  
Selling, general and administrative8,495  24,693  21,377  39,301  
Restructuring and related charges1,424  —  1,424  —  
Total stock-based compensation expense $9,967  $26,563  $23,982  $42,974  
We capitalized $1.2 million and $2.2 million of stock-based compensation for the three months ended June 30, 2020 and 2019, and $2.3 million and $3.5 million for the six months ended June 30, 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 six months ended June 30, 2020:
Restricted Stock UnitsWeighted-Average Grant Date Fair Value (per unit)
Unvested at December 31, 20191,527,014  $74.80  
Granted1,046,656  30.69  
Vested(493,114) 79.81  
Forfeited(566,981) 70.90  
Unvested at June 30, 20201,513,575  43.95  
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, 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  
Granted—  —  —  —  
Vested(102,692) 80.77  —  —  
Forfeited(64,862) 79.92  —  —  
Unvested at June 30, 202036,299  79.10  341,002  60.60  
Maximum shares issuable upon vesting at June 30, 202036,299  341,002