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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 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
 
Six Months Ended
(In thousands)
June 30,
2018
 
July 1,
2017
 
June 30,
2018
 
July 1,
2017
Cost of products sold
$
196

 
$
180

 
$
433

 
$
408

Research and development
837

 
1,299

 
2,044

 
3,149

Selling, general, and administrative
1,367

 
1,450

 
4,723

 
3,215

Total stock-based compensation
$
2,400

 
$
2,929

 
$
7,200

 
$
6,772
Share-based Compensation, Stock Options, Activity
The following table summarizes the activity for our stock options with a market condition during the first six months of fiscal 2018:
(Shares in thousands)
 
Unvested
 
Vested
 
Total
Balance, December 30, 2017
 
707

 
83

 
790

Vested
 
(31
)
 
31

 
—

Exercised
 
—

 
(9
)
 
(9
)
Canceled
 
(428
)
 
(10
)
 
(438
)
Balance, June 30, 2018
 
248

 
95

 
343