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The Company and Basis of Presentation - Liquidity (Details) - USD ($)
1 Months Ended 9 Months Ended
Mar. 21, 2016
Sep. 25, 2015
Mar. 31, 2016
Oct. 02, 2016
Sep. 27, 2015
Jan. 03, 2016
Dec. 28, 2014
Liquidity [Line Items]              
Cash and cash equivalents       $ 17,761,000 $ 23,441,000 $ 19,136,000 $ 30,050,000
Share price (in dollars per share) $ 1.00   $ 1.00        
Common stock, par value (in dollars per share) $ 0.001   $ 0.001 $ 0.001   $ 0.001  
Net proceeds $ 8,800,000   $ 8,800,000 $ 10,337,000 $ 394,000    
Common stock              
Liquidity [Line Items]              
Shares of common stock issued (in shares) 10,000,000.0   10,000,000        
Revolving line of credit | Silicon Valley Bank              
Liquidity [Line Items]              
Cash and cash equivalents in available credit       $ 1,000,000      
Extended period of line of credit   2 years          
Loan advances   $ 6,000,000          
Loan advances subject to increase   $ 12,000,000.0