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Stock-Based Compensation - Schedule of Allocation of Recognized Period Cost (Details) - USD ($)
$ in Thousands
3 Months Ended
Apr. 02, 2017
Apr. 03, 2016
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Total costs and expenses $ 318 $ 562
Cost of revenue    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Total costs and expenses 33 38
Research and development    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Total costs and expenses 139 291
Selling, general and administrative    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Total costs and expenses $ 146 $ 233