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Stock-Based Compensation (Tables)
6 Months Ended
Jun. 30, 2021
Share-based Payment Arrangement [Abstract]  
Summary of Stock Option Activity
A summary of activity in connection with our stock options for the six months ended June 30, 2021, is as follows (number of shares in thousands):
Number of
Shares
Weighted
Average
Exercise
Price per Share
Weighted
Average
Remaining
Contractual Life
in Years
Options outstanding as of December 31, 20201,168 $11.77 5.0
Options granted— — 
Options exercised(120)5.37 
Options cancelled/forfeited— — 
Options outstanding as of June 30, 20211,048 $12.50 3.2
Schedule of Restricted Stock Units Activity
A summary of activity in connection with our RSUs for the six months ended June 30, 2021, is as follows (number of shares in thousands):
Number of SharesWeighted Average Grant Date Fair Value per Share
Unvested as of December 31, 2020483 $80.20 
Granted194 140.30 
Vested(158)60.18 
Forfeited(21)105.98 
Unvested as of June 30, 2021498 $108.77 
Schedule of Restricted Stock Awards Activity
A summary of activity in connection with our restricted stock awards for the six months ended June 30, 2021 is as follows (number of shares in thousands): 
Number of
Shares
Weighted Average
Grant Date
Fair Value per Share
Unvested as of December 31, 2020$153.41 
Granted144.33 
Vested(3)160.34 
Forfeited— — 
Unvested as of June 30, 2021$143.74