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Employee Benefit Plans and Stock-based Compensation (Tables)
9 Months Ended
Sep. 28, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Stock Options Outstanding
The following table summarizes the Company’s stock option activities and related information during the nine months ended September 28, 2018 (in thousands, except per share amounts and terms):
 
 
Stock Options Outstanding
 
 
Number
of
Shares
 
Weighted
Average
Exercise Price
Per Share
 
Weighted
Average
Remaining
Contractual
Term (Years)
 
Aggregate
Intrinsic
Value
Balance at December 31, 2017
 
3,880

 
$
6.04

 
 
 
 
Granted
 

 

 
 
 
 
Exercised
 
(88
)
 
2.93

 
 
 
 
Forfeited
 
(35
)
 
4.76

 
 
 
 
Canceled or expired
 
(538
)
 
8.75

 
 
 
 
Balance at September 28, 2018
 
3,219

 
5.69

 
2.5
 
$
1,907.4

As of September 28, 2018
 
 
 
 
 
 
 
 
Vested and expected to vest
 
3,214

 
5.69

 
2.5
 
$
1,900.0

Exercisable
 
3,051

 
5.74

 
2.5
 
$
1,666.9

Summary of Restricted Stock Units Outstanding
The following table summarizes the Company’s RSUs activities and related information during the nine months ended September 28, 2018 (in thousands, except per share amounts and terms):
 
 
Restricted Stock Units Outstanding
 
 
Number
of
Shares
 
Weighted
Average Grant
Date Fair Value
Per Share
Balance at December 31, 2017
 
2,904

 
$
5.09

Granted
 
3,835

 
3.94

Vested
 
(2,947
)
 
4.87

Forfeited
 
(216
)
 
4.95

Balance at September 28, 2018
 
3,576

 
4.05

Schedule of Defined Benefit Plans Obligations
The table below presents the components of net periodic benefit costs (in thousands):
 
Three months ended
 
Nine months ended
 
September 28, 2018
 
September 29, 2017
 
September 28,
2018
 
September 29,
2017
Service cost
$
59

 
$
55

 
$
185

 
$
165

Interest cost
18

 
16

 
56

 
48

Recognized net actuarial loss

 
1

 

 
4

  Net periodic benefit cost
$
77

 
$
72

 
$
241

 
$
217


Summary of Stock-Based Compensation Expense
Stock-based Compensation
The following table summarizes stock-based compensation for all plans (in thousands):
 
Three months ended
Nine months ended
 
September 28,
2018
 
September 29,
2017
September 28,
2018
 
September 29,
2017
Stock-based compensation in:
 
 
 
 
 
 
Cost of revenue
$
614

 
$
478

$
1,577

 
$
1,623

Research and development expense
1,676

 
1,183

4,298

 
3,496

Selling, general and administrative expense
3,143

 
2,059

8,327

 
5,988

Total stock-based compensation in operating expense
4,819

 
3,242

12,625

 
9,484

Total stock-based compensation
$
5,433

 
$
3,720

$
14,202

 
$
11,107

Valuation Assumptions for Stock Options
At the date of grant, the Company estimated the fair value of each stock option grant and stock purchase right granted under the ESPP using the following weighted average assumptions:
 
Stock Options
 
Nine months ended
 
September 29,
2017
Expected term (years)
4.6
Volatility
43%
Risk-free interest rate
1.7%
Expected dividends
0.0%
Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions
 
ESPP Purchase Period Ending
 
December 31,
2018
 
July 2,
2018
 
December 31,
2017
 
June 30,
2017
Expected term (years)
0.5

 
0.5

 
0.5

 
0.5

Volatility
51
%
 
60
%
 
43
%
 
41
%
Risk-free interest rate
2.1
%
 
1.7
%
 
1.2
%
 
1.0
%
Expected dividends
0.0
%
 
0.0
%
 
0.0
%
 
0.0
%
Estimated weighted average fair value per share at purchase date
$1.32
 
$1.34
 
$1.42
 
$1.40