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The Company and Basis of Presentation - Liquidity (Details) - USD ($)
1 Months Ended 3 Months Ended
Mar. 28, 2017
Sep. 25, 2015
Mar. 31, 2017
Mar. 31, 2016
Apr. 02, 2017
Apr. 03, 2016
Jan. 01, 2017
Jan. 03, 2016
Liquidity [Line Items]                
Cash and cash equivalents         $ 26,674,000 $ 23,302,000 $ 14,870,000 $ 19,136,000
Revolving line of credit         $ 6,000,000   $ 6,000,000  
Share price (in dollars per share) $ 1.50   $ 1.50 $ 1.00 $ 1.78      
Common stock, par value (in dollars per share) $ 0.001   $ 0.001   $ 0.001   $ 0.001  
Net proceeds $ 15,800,000   $ 15,800,000 $ 8,800,000 $ 17,069,000 $ 10,000,000    
Common stock                
Liquidity [Line Items]                
Shares of common stock issued (in shares) 11,300,000.0   11,333,333 10,000,000        
Revolving line of credit | Silicon Valley Bank                
Liquidity [Line Items]                
Cash and cash equivalents in available credit         6,000,000      
Revolving line of credit         $ 6,000,000      
Extended period of line of credit   2 years            
Loan advances   $ 6,000,000            
Loan advances subject to increase   $ 12,000,000.0