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Condensed Consolidated Statements of Operations (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jul. 01, 2017
Jul. 02, 2016
Jul. 01, 2017
Jul. 02, 2016
Stock-based compensation expense $ 381 $ 303 $ 645 $ 761
Cost of sales        
Stock-based compensation expense 13 13 29 28
Research and development        
Stock-based compensation expense 114 55 180 190
Selling, general and administrative        
Stock-based compensation expense $ 254 $ 235 $ 436 $ 543