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Equity Incentive Plans (Tables)
 3 Months Ended
Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Nonvested Restricted Stock Units Activity
The following table summarizes activity related to our RSUs under the Equity Incentive Plan for the three months ended March 31, 2018:
 
Number
Outstanding
 
Weighted
Average
Grant Date
Fair Value
 
Weighted Average Remaining Contractual Term
(in years)
 
Aggregate Intrinsic Value
   (in thousands) (1)
Unvested as of January 1, 2018
1,624,390

 
$
29.94

 
 
 
 
Granted
562,380

 
$
43.35

 
 
 
 
Vested
(359,863
)
 
$
29.00

 
 
 
 
Forfeited / Canceled
(18,015
)
 
$
31.29

 
 
 
 
Unvested as of March 31, 2018
1,808,892

 
$
34.28

 
 
 
 
Expected to vest after March 31, 2018
1,630,647

 
$
34.26

 
3.0
 
$
61,883
Schedule of Share-based Compensation, Stock Options, Activity
The following table summarizes activity related to our stock options under the Equity Incentive Plan for the three months ended March 31, 2018:
 
Number
Outstanding
 
Weighted
Average Exercise Price
 
Weighted Average Remaining Contractual Term
(in years)
 
Aggregate Intrinsic Value
   (in thousands) (1)
Balance as of January 1, 2018
1,738,073

 
$
9.20

 
 
 
 
Exercised
(226,260
)
 
$
9.97

 
 
 
$
7,123

Canceled
(509
)
 
$
32.31

 
 
 
 
Balance as of March 31, 2018
1,511,304

 
$
9.08

 
1.4
 
$
43,631

Exercisable as of March 31, 2018
1,511,304

 
$
9.08

 
1.4
 
$
43,631