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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 29, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Stock-Based Compensation Expense
Total stock-based compensation expense included in our Consolidated Statements of Operations is presented in the following table:
 
Three Months Ended
 
Nine Months Ended
(In thousands)
September 29,
2018
 
September 30,
2017
 
September 29,
2018
 
September 30,
2017
Cost of products sold
$
219

 
$
154

 
$
652

 
$
562

Research and development
926

 
980

 
2,970

 
4,129

Selling, general, and administrative
1,563

 
1,380

 
6,286

 
4,595

Total stock-based compensation
$
2,708

 
$
2,514

 
$
9,908

 
$
9,286
Share-based Compensation, Stock Options, Activity
The following table summarizes the activity for our stock options and RSUs with a performance condition during the first nine months of fiscal 2018:
(Shares in thousands)
 
Unvested
 
Vested
 
Total
Balance, December 30, 2017
 
707

 
83

 
790

Granted
 
573

 
—

 
573

Vested
 
(31
)
 
31

 
—

Exercised
 
—

 
(78
)
 
(78
)
Canceled
 
(429
)
 
(10
)
 
(439
)
Balance, September 29, 2018
 
820

 
26

 
846