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Common Stock and Stockholders' Equity (Tables)
 3 Months Ended
Mar. 31, 2017
Equity [Abstract]  
Summary of Stock Option and RSU Award Activity
A summary of our stock option and RSU activity for the three months ended March 31, 2017 is as follows (in thousands, except per share information):
 
 
 
 
Options Outstanding
 
RSUs Outstanding
Shares
Available
for Grant
 
Number of
Shares
 
Weighted
Average
Exercise Price
 
Weighted
Average
Remaining
Contractual
Term
 
Aggregate
Intrinsic
Value
 
Outstanding
RSUs
 
Weighted
Average
Grant Date
Fair Value
 
 
 
 
 
 
(In years)
 
 
 
 
 
 
Outstanding — January 1, 2017
6,039

 
8,479

 
$
14.52

 
7.49
 
$
66,449

 
6,936

 
$
20.81

Increase in authorized shares
4,833

 
 
 
 
 
 
 
 
 
 
 
 
Stock options granted
(170
)
 
170

 
24.51

 
 
 
 
 
 
 
 
RSUs granted
(892
)
 
 
 
 
 
 
 
 
 
892

 
24.64

Stock options exercised
 
 
(1,114
)
 
10.49

 
 
 
 
 
 
 
 
RSUs vested
 
 
 
 
 
 
 
 
 
 
(930
)
 
17.34

Stock options forfeited or
   canceled
156

 
(156
)
 
23.33

 
 
 
 
 
 
 
 
RSUs forfeited or canceled
381

 
 
 
 
 
 
 
 
 
(381
)
 
22.29

Outstanding — March 31, 2017
10,347

 
7,379

 
$
15.17

 
7.39
 
$
95,123

 
6,517

 
$
21.74