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Stock-Based Compensation - Schedule of Allocation of Recognized Period Cost (Details) - USD ($)
 3 Months Ended 9 Months Ended
Oct. 01, 2017
Oct. 02, 2016
Oct. 01, 2017
Oct. 02, 2016
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total costs and expenses $ 395,000 $ 457,000 $ 1,060,000 $ 1,458,000
Stock-based compensation, capitalized costs 0 0 0 0
Cost of revenue        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total costs and expenses 32,000 34,000 85,000 119,000
Research and development        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total costs and expenses 151,000 137,000 424,000 603,000
Selling, general and administrative        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total costs and expenses $ 212,000 $ 286,000 $ 551,000 $ 736,000