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Debt (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 29, 2019
Aug. 27, 2018
Sep. 28, 2019
Sep. 28, 2019
Sep. 29, 2018
Nov. 18, 2015
Long-term debt            
Original issue discount         $ 170  
Exercise price of warrants (in dollars per share)     $ 0.62 $ 0.62    
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 $ 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, net of discounts and costs     15,700 15,700    
Unsecured Convertible Note Due August 2020            
Long-term debt            
Face amount   $ 2,300        
Original issue discount   $ 200   200    
Interest rate (as a percent)   8.00%        
Debt conversion price (in dollars per share)   $ 0.36        
Debt, net of discounts and costs   $ 1,000        
Maximum Monthly Redemption Amount   $ 350        
Lowest closing bid, percentage   85.00%        
Redemption price floor, per share   $ 0.11        
Maximum redemption amount honored   $ 150        
Redemption conversion price   $ 0.06        
Proceeds from Notes Payable       2,100    
Debt issuance, liability component     1,900 1,900    
Debt issuance, equity component   $ 200        
Iliad Note [Member]            
Long-term debt            
Additional conversion of principal and accrued interest     $ 800 $ 900    
Additional conversion of shares     3,247,000 3,624,074    
Conversion of principal and accrued interest     $ 0 $ 500    
Conversion of shares       1,388,890    
Iliad Note [Member] | Subsequent Event            
Long-term debt            
Conversion of principal and accrued interest $ 700          
Conversion of shares 2,905,873