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Condensed Consolidated Statements of Operations (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended
Apr. 01, 2017
Apr. 02, 2016
Stock-based compensation expense $ 264 $ 458
Cost of sales    
Stock-based compensation expense 16 15
Research and development    
Stock-based compensation expense 66 135
Selling, general and administrative    
Stock-based compensation expense $ 182 $ 308