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Equity - Equity Incentive Plan (Details) - USD ($)
3 Months Ended
Apr. 01, 2020
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Share-based compensation        
Warrants and Rights Remaining Term   1 year    
Warrants Intrinsic Value Outstanding   $ 0    
Inducement Stock Options [Member]        
Share-based compensation        
Allocated Share-based Compensation Expense   13,000 $ 59,000  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized   $ 52,000    
Contractual life   10 years    
Inducement Stock Options [Member] | Minimum [Member]        
Share-based compensation        
Exercise price (in dollars per share)   $ 1.16    
Equity Incentive Plan [Member]        
Share-based compensation        
Number of common stock reserved for issuance   4,005,339    
Maximum increase in available number of authorized shares as a percentage of new shares issued   15.00%    
Reserved but unissued shares under the Plan, beginning of year 444,161      
Reserved but unissued shares under the Plan, end of period (in shares)   444,161    
Share-based Compensation Outstanding - Reserved but unissued shares under the Plan       2,131,058
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number   2,147,348   1,461,073
Allocated Share-based Compensation Expense   $ 80,000 $ 126,000  
Shares Reserved Unissued   849,990    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized   $ 239,000    
Stock options awards for directors 94,500      
Exercise price (in dollars per share) $ 0.72      
Contractual life 10 years      
Share based compensation grants   53,000    
Equity Incentive Plan [Member] | Inducement Stock Options [Member]        
Share-based compensation        
Share-based Compensation Outstanding - Reserved but unissued shares under the Plan   2,563,470