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Description of Business (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
Mar. 06, 2020
USD ($)
Jun. 24, 2019
USD ($)
Sep. 12, 2018
USD ($)
$ / shares
shares
Aug. 29, 2018
USD ($)
shares
Aug. 27, 2018
USD ($)
May 17, 2018
USD ($)
$ / shares
shares
Nov. 14, 2017
USD ($)
Dec. 28, 2019
USD ($)
segment
$ / shares
shares
Dec. 29, 2018
USD ($)
shares
Apr. 17, 2017
$ / shares
Number of reportable segment | segment               1    
Net loss               $ (12,452) $ (17,120)  
Common stock shares issued | shares           5,405,405     31,786,146  
Net purchase price                 $ 15,762  
Share purchase price | $ / shares           $ 0.148       $ 6.56
Proceeds from issuance of common stock, net           $ 800   $ 6,352 15,762  
Exercise price of warrants (in dollars per share) | $ / shares               $ 0.62    
Original issue discount               $ 170 170  
Outstanding principal and accrued interest               $ 412 376  
Maximum                    
Exercise price of warrants (in dollars per share) | $ / shares               $ 0.25    
Securities purchase agreement                    
Common stock shares issued | shares     22,222,220              
Share purchase price | $ / shares     $ 0.45              
Proceeds from issuance of common stock, net     $ 9,200              
Warrants issued to purchase additional shares | shares     11,111,110              
Warrants exercisable (in days)     181 days              
Warrants term     5 years              
Exercise price of warrants (in dollars per share) | $ / shares     $ 0.655              
Common Stock Purchase Agreement                    
Common stock shares issued | shares               19,044,762    
Net purchase price               $ 6,400    
Purchase Agreement Term 36 months 36 months                
Common Stock Purchase Agreement | Maximum                    
Issuance of commitment shares $ 20,000 $ 10,000                
2020 Purchase Agreement                    
Issuance of commitment shares $ 20,000                  
Purchase Agreement Term 36 months                  
Unsecured Convertible Note Due August 2020                    
Face amount         $ 2,300          
Original issue discount         $ 200          
Interest rate (as a percent)         8.00%          
Outstanding principal and accrued interest               $ 0 $ 2,300  
ATM Program                    
Common stock shares issued | shares       40,680,368            
Proceeds from issuance of common stock, net       $ 8,600            
Aggregate gross proceeds agent can sell shares of stock             $ 9,000