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Employee Benefit Plans and Stock-based Compensation (Tables)
 9 Months Ended
Sep. 29, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Company's Stock Option and Restricted Stock Unit Activity
 
 
 
Stock Options Outstanding
 
RSUs Outstanding**
 
Shares
Available for
Grant
 
Number
of
Shares
 
Weighted
Average
Exercise Price
 
Number
of
Units
 
Weighted
Average
Grant
Date Fair
Value
Balance at December 31, 2016
3,912

 
5,019

 
$
6.01

 
3,864

 
$
4.26

Authorized
7,400

 
—

 
—

 
—

 
—

Granted*
(4,446
)
 
30

 
5.10

 
2,943

 
5.40

Options exercised
—

 
(97
)
 
3.03

 
—

 
—

Shares released
—

 
—

 
—

 
(2,244
)
 
4.12

Forfeited*
2,490

 
(717
)
 
5.95

 
(1,182
)
 
5.05

Balance at September 29, 2017
9,356

 
4,235

 
$
6.09

 
3,381

 
$
5.04
Summary of Stock Options Outstanding
The following table summarizes information about stock options outstanding as of September 29, 2017 (in thousands, except per share amounts and terms):
 
Number
of
Shares
 
Weighted
Average
Exercise
Price
 
Weighted
Average
Remaining
Contractual
Term (Years)
 
Aggregate
Intrinsic
Value
Vested and expected to vest
4,176

 
$
6.10

 
3.1
 
$
84

Exercisable
3,505

 
6.31

 
2.7
 
84
Summary of Restricted Stock Units Outstanding
The following table summarizes information about RSUs and PRSUs outstanding as of September 29, 2017 (in thousands, except term):
 
Number of
Shares
Underlying
Restricted
Stock
Units
 
Weighted
Average
Remaining
Vesting
Period
(Years)
 
Aggregate
Fair
Value
Vested and expected to vest
2,759

 
0.8
 
$
8,415
Schedule of Defined Benefit Plans Obligations
The table below shows the components of net periodic benefit costs (in thousands):
 
Three months ended
 
Nine months ended
 
September 29, 2017
 
September 30, 2016
 
September 29,
2017
 
September 30,
2016
Service cost
$
55

 
$
70

 
$
165

 
$
164

Interest cost
16

 
29

 
48

 
68

Recognized net actuarial loss
1

 
—

 
4

 
—

  Net periodic benefit cost included in operating loss
$
72

 
$
99

 
$
217

 
$
232
Summary of Stock-Based Compensation Expense
Stock-based Compensation
The following table summarizes stock-based compensation expense for all plans (in thousands):
 
Three months ended
 
Nine months ended
 
September 29,
2017
 
September 30,
2016
 
September 29,
2017
 
September 30,
2016
Stock-based compensation in:
 
 
 
 
 
 
 
Cost of revenue
$
478

 
$
360

 
$
1,623

 
$
1,011

Research and development expense
1,183

 
771

 
3,496

 
2,581

Selling, general and administrative expense
2,059

 
1,549

 
5,988

 
4,950

Total stock-based compensation in operating expense
3,242

 
2,320

 
9,484

 
7,531

Total stock-based compensation
$
3,720

 
$
2,680

 
$
11,107

 
$
8,542
Valuation Assumptions for Stock Options
 
Employee Stock Options
 
Three months ended
 
Nine months ended
 
September 30,
2016
 
September 29,
2017
 
September 30,
2016
Expected term (years)
4.30

 
4.60

 
4.30

Volatility
39
%
 
43
%
 
36
%
Risk-free interest rate
1.0
%
 
1.7
%
 
1.4
%
Expected dividends
0.0
%
 
0.0
%
 
0.0
%
Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions
 
ESPP Purchase Period Ending
 
December 31,
2017
 
June 30,
2017
 
December 31,
2016
 
July 1,
2016
Expected term (years)
0.50

 
0.49

 
0.50

 
0.5

Volatility
43
%
 
41
%
 
70
%
 
54
%
Risk-free interest rate
1.2
%
 
1.0
%
 
0.6
%
 
0.4
%
Expected dividends
0.0
%
 
0.0
%
 
0.0
%
 
0.0
%
Estimated weighted average fair value per share at purchase date
$1.42
 
$1.40
 
$1.04
 
$1.19