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The Company and Basis of Presentation - Liquidity (Details)
1 Months Ended 9 Months Ended
Aug. 31, 2017
USD ($)
Mar. 28, 2017
USD ($)
$ / shares
shares
Mar. 31, 2017
USD ($)
$ / shares
shares
Mar. 31, 2016
USD ($)
$ / shares
shares
Oct. 01, 2017
USD ($)
$ / shares
Oct. 02, 2016
USD ($)
Jan. 01, 2017
USD ($)
$ / shares
Jan. 03, 2016
USD ($)
Liquidity [Line Items]                
Cash and cash equivalents         $ 19,029,000 $ 17,761,000 $ 14,870,000 $ 19,136,000
Revolving line of credit         $ 6,000,000   $ 6,000,000  
Share price (in dollars per share) | $ / shares   $ 1.50 $ 1.50 $ 1.00 $ 1.68      
Common stock, par value (in dollars per share) | $ / shares   $ 0.001 $ 0.001   $ 0.001   $ 0.001  
Net proceeds from issuance of common stock   $ 15,200,000 $ 15,200,000 $ 8,800,000 $ 17,316,000 $ 10,448,000    
Common stock                
Liquidity [Line Items]                
Shares of common stock issued (in shares) | 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 1 year              
Unrestricted cash or cash equivalents (at least) $ 6,000,000              
Long-term portion of obligations (at least) 1.40              
Loan advances $ 6,000,000              
Loan advances subject to increase $ 12,000,000.0