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Employee Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2019
Employee Benefits and Share-based Compensation, Noncash [Abstract]  
Schedule of Stock Option Activity
Stock option activity during the six months ended June 30, 2019 was as follows:
 
Number of shares
 
Weighted Average Exercise Price Per Share
 
(In thousands)
 
(In dollars)
Outstanding as of December 31, 2018
1,969

 
$
25.30

Exercised
(144
)
 
$
20.50

Cancelled
(16
)
 
$
36.27

Outstanding as of June 30, 2019
1,809

 
$
25.59
Schedule of RSU Activity
RSU activity during the six months ended June 30, 2019 was as follows:
 
Number of shares
 
Weighted Average Grant Date Fair Value Per Share
 
(In thousands)
 
(In dollars)
Outstanding as of December 31, 2018
1,627

 
$
34.31

Granted
489

 
$
33.36

Vested
(502
)
 
$
31.29

Cancelled
(53
)
 
$
35.59

Outstanding as of March June 30, 2019
1,561

 
$
34.94
Schedule of Weighted Average Assumptions The table below sets forth the weighted average assumptions used to estimate the fair value of option grants and purchase rights granted during the six months ended June 30, 2019 and July 1, 2018.
 
Six Months Ended
 
Stock Options
 
ESPP
 
June 30,
2019
 
July 1,
2018
 
June 30,
2019
 
July 1,
2018
Expected life (in years)
N/A
 
4.4

 
0.5

 
0.5

Risk-free interest rate
N/A
 
2.32
%
 
2.49
%
 
1.81
%
Expected volatility
N/A
 
30.9
%
 
42.6
%
 
37.1
%
Dividend yield
N/A
 
—

 
—

 
—
Schedule of Total Stock-Based Compensation Expense Resulting from Stock Options, Restricted Stock Awards, and the Employee Stock Purchase Plan
The following table sets forth the stock-based compensation expense resulting from stock options, RSUs and the ESPP included in the Company’s unaudited condensed consolidated statements of operations:
 
Three Months Ended
 
Six Months Ended
 
June 30,
2019
 
July 1,
2018
 
June 30,
2019
 
July 1,
2018
 
(In thousands)
Cost of revenue
$
755

 
$
572

 
$
1,423

 
$
1,135

Research and development
1,288

 
1,122

 
2,480

 
2,134

Sales and marketing
2,085

 
2,188

 
4,126

 
4,393

General and administrative
2,611

 
3,364

 
5,168

 
6,448

Total stock-based compensation
$
6,739

 
$
7,246

 
$
13,197

 
$
14,110