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Equity-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]  
Activity Relating to Stock Options
The following table presents activity relating to stock options for the year ended December 31, 2019:
 
 
Shares
 
Weighted-Average
Exercise Price
 
Weighted-Average
Remaining
Contractual Term
(Years)
Outstanding at December 31, 2018
 
79,802

 
$
3.05

 
2.5
Options exercised
 
(35,996
)
 
$
3.11

 
 
Options expired
 
(200
)
 
$
3.42

 
 
Outstanding and exercisable at December 31, 2019
 
43,606

 
$
3.00

 
1.5
Activity Relating to Restricted Stock
The following table presents activity relating to restricted common stock for the year ended December 31, 2019:
 
 
Shares
 
Weighted-Average Grant Date
Fair Value
Unvested at December 31, 2018
 
20,000

 
$
44.34

Restricted stock vested
 
(20,000
)
 
$
44.34

Unvested as of December 31, 2019
 
—

 
$
—
Activity Relating to Restricted Stock Units
The following table presents activity relating to RSUs for the year ended December 31, 2019:
 
 
Shares
 
Weighted-Average
Grant Date
Fair Value
Unvested at December 31, 2018
 
7,970,959

 
$
72.43

RSUs granted
 
4,420,948

 
$
120.29

RSUs vested
 
(2,835,165
)
 
$
74.47

RSUs forfeited/canceled
 
(1,444,006
)
 
$
84.51

Outstanding as of December 31, 2019
 
8,112,736

 
$
95.69