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Employee Benefit Plans and Stock-based Compensation (Tables)
 3 Months Ended
Mar. 29, 2019
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 three months ended March 29, 2019 (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, 2018
 
3,068

 
$
5.76

 
 
 
 
Exercised
 
(6
)
 
2.25

 
 
 
 
Canceled or expired
 
(379
)
 
6.14

 
 
 
 
Balance at March 29, 2019
 
2,683

 
5.71

 
2.4
 
$
1,646.6

As of March 29, 2019
 
 
 
 
 
 
 
 
Vested and expected to vest
 
2,683

 
5.71

 
2.4
 
$
1,646.3

Exercisable
 
2,673

 
5.72

 
2.4
 
$
1,633.5
Summary of Restricted Stock Units Outstanding
The following table summarizes the Company’s RSUs activities and related information during the three months ended March 29, 2019 (in thousands, except per share amounts):
 
 
Restricted Stock Units Outstanding
 
 
Number
of
Shares
 
Weighted
Average Grant
Date Fair Value
Per Share
Balance at December 31, 2018
 
3,403

 
$
3.99

Granted
 
35

 
5.49

Vested
 
(1,313
)
 
3.91

Forfeited
 
(20
)
 
4.01

Balance at March 29, 2019
 
2,105

 
4.10
Schedule of Defined Benefit Plans Obligations
The table below presents the components of net periodic benefit costs (in thousands):
 
Three months ended
 
March 29, 2019
 
March 30, 2018
Service cost
$
57

 
$
63

Interest cost
20

 
19

  Net periodic benefit cost
$
77

 
$
82
Summary of Stock-Based Compensation Expense
Stock-based Compensation
The following table summarizes stock-based compensation for all plans (in thousands):
 
Three months ended
 
March 29,
2019
 
March 30,
2018
Stock-based compensation in:
 
 
 
Cost of revenue
$
225

 
$
515

Research and development expense
616

 
1,804

Selling, general and administrative expense
1,272

 
3,438

Total stock-based compensation in operating expense
1,888

 
5,242

Total stock-based compensation
$
2,113

 
$
5,757
Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions
 
ESPP Purchase Period Ending
 
July 1,
2019
 
July 2,
2018
Expected term (years)
0.5

 
0.5

Volatility
43
%
 
60
%
Risk-free interest rate
2.5
%
 
1.7
%
Expected dividends
0.0
%
 
0.0
%
Estimated weighted average fair value per share at purchase date
$1.31
 
$1.34