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Equity-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2019
Share-based Payment Arrangement [Abstract]  
Summary of Activity Relating to Stock Options
The following table presents activity relating to stock options for the nine months ended September 30, 2019: 
 
 
Options
 
Weighted-Average Exercise Price
 
Weighted-Average Remaining Contractual Term (Years)
Outstanding at December 31, 2018
 
79,802

 
$
3.05

 
2.5
Options exercised
 
(28,624
)
 
$
3.14

 
 
Outstanding and exercisable at September 30, 2019
 
51,178

 
$
3.00

 
1.7
Summary of Activity Relating to Restricted Stock
The following table presents activity relating to restricted common stock for the nine months ended September 30, 2019: 
 
 
Shares
 
Weighted-
Average Grant Date Fair Value
Unvested at December 31, 2018
 
20,000

 
$
44.34

Unvested as of September 30, 2019
 
20,000

 
$
44.34


The following table presents activity relating to RSUs for the nine months ended September 30, 2019: 
 
 
Shares
 
Weighted-
Average Grant
Date Fair Value
Outstanding at December 31, 2018
 
7,970,959

 
$
72.43

RSUs granted
 
2,832,312

 
$
142.03

RSUs vested
 
(2,114,736
)
 
$
70.46

RSUs forfeited/canceled
 
(865,653
)
 
$
85.75

Outstanding as of September 30, 2019
 
7,822,882

 
$
96.69