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Equity Award Plan Activities (Tables)
9 Months Ended
Sep. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Stock-Based Compensation Expense
Total stock-based compensation expense related to options, restricted stock awards, employee stock purchases, restricted stock units and stock purchase rights granted were allocated as follows (in thousands):
 
Three Months Ended
September 30,
Nine Months Ended
September 30,
 
2017
 
2016
2017
 
2016
Cost of revenue
$
1,113

 
$
955

$
3,224

 
$
2,616

Research and development
11,048

 
8,010

30,977

 
23,062

Sales and marketing
5,115

 
3,947

12,651

 
11,374

General and administrative
2,876

 
2,204

8,139

 
5,656

           Total stock-based compensation
$
20,152

 
$
15,116

$
54,991

 
$
42,708

Schedule of Option Activity under Equity Stock Plans
The following table summarizes the option activity under our equity stock plans and related information:
 
 
Options Outstanding 
 
 
 
 
 
 
Number of
Shares
Underlying
Outstanding Options (in thousands)
 
Weighted-
Average
Exercise
Price per Share
 
Weighted-
Average
Remaining
Contractual
Term (Years) of
Stock Options
 
Aggregate
Intrinsic
Value
of Stock
Options
Outstanding
(in thousands)
Outstanding—December 31, 2016
 
9,509

 
$
28.79

 
6.9
 
$
646,394

Options granted
 
170

 
96.61

 
 
 
 
Options exercised
 
(1,730
)
 
16.97

 
 
 
 
Options canceled
 
(322
)
 
32.89

 
 
 
 
Outstanding—September 30, 2017
 
7,627

 
$
32.81

 
6.4
 
$
1,195,859

Vested and exercisable—September 30, 2017
 
3,035

 
$
19.91

 
5.7
 
$
515,111

Vested and expected to vest—September 30, 2017
 
7,627

 
$
32.81

 
6.4
 
$
1,195,859

Schedule of Restricted Stock Units Activity
A summary of the RSU activity under our stock plans during the reporting period and a summary of information related to RSUs expected to vest are presented below (in thousands, except per share and year amounts):
 
Number of
Shares
 
Weighted-
Average Grant
Date Fair Value Per Share
 
Weighted-Average
Remaining
Contractual Term (in years)
 
Aggregate Intrinsic Value
Unvested balance—December 31, 2016
1,375

 
$
74.23

 
1.8
 
$
133,081

       RSUs granted
666

 
137.26

 
 
 
 
       RSUs vested
(339
)
 
75.63

 
 
 
 
       RSUs forfeited
(60
)
 
77.21

 
 
 
 
Unvested and expected to vest balance—September 30, 2017
1,642

 
$
99.41

 
1.8
 
$
311,368

Schedule of EIP Stock Activity and Shares Available for Future Grant
The following table presents EIP stock activity and the total number of shares available for future grant as of September 30, 2017 (in thousands):
 
 
 
 
 
Number of Shares
Balance at December 31, 2016
 
11,754

Authorized
 
2,124

Options granted
 
(170
)
RSUs granted
 
(666
)
Options canceled
 
322

Options repurchased
 
2

RSUs forfeited
 
60

Shares traded for taxes
 
17

Balance at September 30, 2017
 
13,443