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Condensed Consolidated Statements of Operations (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
Stock-based compensation expense $ 173 $ 381 $ 414 $ 645
Cost of sales        
Stock-based compensation expense 6 13 12 29
Research and development        
Stock-based compensation expense 56 114 136 180
Selling, general and administrative        
Stock-based compensation expense $ 111 $ 254 $ 266 $ 436