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Debt (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Aug. 27, 2018
Dec. 28, 2019
Dec. 29, 2018
Nov. 18, 2015
Long-term debt        
Original issue discount   $ 170 $ 170  
Exercise price of warrants (in dollars per share)   $ 0.62    
Interest expense   $ (945) (739)  
Debt outstanding   16,205 17,722  
Debt, net of discounts and costs   16,645    
Outstanding principal and accrued interest   412 376  
Debt issuance costs     23  
Proceeds from issuance of debt, net of $170 discount     2,100  
SVIC Warrant        
Long-term debt        
Number of shares which may be purchased under warrant       2,000,000
Exercise price of warrants (in dollars per share)       $ 0.30
Fair value of warrants       $ 1,200
Senior Secured Convertible Note Due December 2025 [member]        
Long-term debt        
Face amount       $ 15,000
Interest rate (as a percent)       2.00%
Debt conversion price (in dollars per share)       $ 1.25
Debt outstanding   16,233 15,934  
Debt, net of discounts and costs   15,800 15,200  
Senior Secured Convertible Note Due December 2025 [member] | SVIC Warrant        
Long-term debt        
Interest expense   $ 200 200  
Effective interest rate   3.40%    
Unsecured Convertible Note Due August 2020        
Long-term debt        
Face amount $ 2,300      
Original issue discount $ 200      
Interest rate (as a percent) 8.00%      
Debt conversion price (in dollars per share) $ 0.36      
Interest expense   $ 300 100  
Effective interest rate   22.50%    
Debt outstanding     2,332  
Debt, net of discounts and costs   $ 2,000    
Maximum Monthly Redemption Amount $ 350      
Lowest closing bid, percentage 85.00%      
Outstanding principal and accrued interest   0 $ 2,300  
Redemption price floor, per share $ 0.11      
Maximum redemption amount honored $ 150      
Redemption conversion price $ 0.06      
Debt issuance, liability component $ 1,900      
Debt issuance, equity component $ 200      
Iliad Note [Member]        
Long-term debt        
Additional conversion of principal and accrued interest   $ 1,900    
Additional conversion of shares   7,778,270    
Outstanding principal and accrued interest   $ 0    
Conversion of principal and accrued interest   $ 500    
Conversion of shares   1,388,890