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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of stock option activity
A summary of stock option activity during the nine months ended September 30, 2016 is as follows (in thousands, except for per share amounts):
 
Shares
 
Weighted-
Average
Exercise
Price (in
dollars per
share)
 
Weighted-
Average
Contractual
Life (In
Years)
 
Aggregate
Intrinsic
Value
Options outstanding at December 31, 2015
4,408

 
$
28.75

 
 
 
 

Granted
2,095

 
36.10

 
 
 
 

Exercised
(126
)
 
19.36

 
 
 
 

Cancelled
(102
)
 
42.12

 
 
 
 

Expired
(1
)
 
79.90

 
 
 
 

Options outstanding at September 30, 2016
6,274

 
$
31.17

 
8.16
 
$
156,384

Options exercisable at September 30, 2016
2,469

 
$
19.77

 
6.86
 
$
87,873

Options vested or expected to vest at September 30, 2016
6,153

 
$
30.98

 
8.14
 
$
154,436
Summary of restricted stock units activity
A summary of RSU activity during the nine months ended September 30, 2016 is as follows (in thousands, except for per share amounts):

 
RSUs
 
Weighted-
Average
Grant Date
Fair Value 
(in dollars 
per share)
RSUs Outstanding at December 31, 2015
—

 
$
—

Granted
59

 
33.03

Vested
—

 
—

Forfeited
(2
)
 
33.03

RSUs Outstanding at September 30, 2016
57

 
$
33.03