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Equity-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Activity Relating to Stock Options
The following table presents activity relating to stock options for the six months ended June 30, 2018: 
 
 
Options
 
Weighted-
Average 
Exercise
Price
 
Weighted-
Average
Remaining
Contractual
Term (Years)
Outstanding at December 31, 2017
 
126,383

 
$
3.02

 
3.5
Options exercised
 
(24,996
)
 
$
2.98

 
 
Outstanding and exercisable at June 30, 2018
 
101,387

 
$
3.03

 
3.0
Summary of Activity Relating to Restricted Stock
The following table presents activity relating to RSUs for the six months ended June 30, 2018: 
 
 
Shares
 
Weighted-
Average Grant
Date Fair Value
Outstanding at December 31, 2017
 
6,853,606

 
$
46.28

RSUs granted
 
2,540,290

 
$
83.28

RSUs vested
 
(1,269,782
)
 
$
42.11

RSUs forfeited/canceled
 
(602,038
)
 
$
50.53

Outstanding and expected to vest in the future as of June 30, 2018
 
7,522,076

 
$
59.22

The following table presents activity relating to restricted common stock for the six months ended June 30, 2018: 
 
 
Shares
 
Weighted-
Average Grant Date Fair Value
Unvested at December 31, 2017
 
40,000

 
$
44.34

Unvested and expected to vest in the future as of June 30, 2018
 
40,000

 
$
44.34