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Stockholders' Equity (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Sep. 12, 2018
Aug. 29, 2018
May 17, 2018
Nov. 14, 2017
Apr. 17, 2017
Dec. 28, 2019
Dec. 29, 2018
Aug. 15, 2018
Serial Preferred Stock                
Preferred Stock, Shares Authorized           10,000,000 10,000,000  
Preferred Stock, Par or Stated Value Per Share           $ 0.001 $ 0.001  
Preferred Stock, Shares Outstanding           0 0  
Number of Rights Authorized for Each Outstanding Share of Stock         1      
Number of Shares Issued when Right is Exercised         0.001      
Purchase price per share     $ 0.148   $ 6.56      
Number of Days Rights are to be Distributed         10 days      
Minimum Beneficial Ownership Percentage for Rights to be Distributed         15.00%      
Common Stock                
Common stock, par value     $ 0.001     $ 0.001 $ 0.001  
Common stock, shares authorized           300,000,000 300,000,000 150,000,000
Shares issued     5,405,405       31,786,146  
Proceeds from issuance of common stock     $ 800     $ 6,352 $ 15,762  
Exercise price of warrants           $ 0.62    
Stock-Based Compensation                
Shares available for issuance           1,101,572    
Series A Preferred Stock                
Serial Preferred Stock                
Preferred Stock, Shares Authorized           1,000,000 1,000,000  
Preferred Stock, Par or Stated Value Per Share           $ 0.001 $ 0.001  
Stock-Based Compensation                
Shares available for issuance         1,000,000      
ATM Program                
Common Stock                
Shares issued   40,680,368            
Proceeds from issuance of common stock   $ 8,600            
Aggregate gross proceeds agent can sell shares of stock       $ 9,000        
Common Stock                
Common Stock                
Shares issued             59,414,000  
Proceeds from issuance of common stock             $ 5,800  
Securities purchase agreement                
Serial Preferred Stock                
Purchase price per share $ 0.45              
Common Stock                
Shares issued 22,222,220              
Proceeds from issuance of common stock $ 9,200              
Warrants issued to purchase additional shares 11,111,110              
Number of days until warrants are exercisable 181 days              
Term of warrants 5 years              
Exercise price of warrants $ 0.655