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Debt (Narrative) (Details) - USD ($)
6 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Dec. 30, 2017
Nov. 18, 2015
Long-term debt        
Exercise price of warrants (in dollars per share) $ 0.55   $ 0.66  
Amortization of debt discount $ 107,000 $ 108,000    
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 1,165,000      
Debt discount fees for professional services 154,000      
Interest Expense | SVIC Warrant        
Long-term debt        
Amortization of debt discount $ 5,400,010,700,054,000 $ 108,000    
SVIC Senior Secured Convertible Promissory Note        
Long-term debt        
Face amount       $ 15,000,000
Interest rate (as a percent)       2.00%
Debt conversion price (in dollars per share)       $ 1.25