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Equity - Incentive Stock Options - Valuation assumptions (Details) - Inducement Stock Options [Member] - USD ($)
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Share-based compensation    
Contractual life 10 years  
Vesting period 2 years  
Fair value of options granted (in dollars) $ 176,000  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized 52,000  
Compensation expense $ 13,000 $ 59,000
Minimum [Member]    
Share-based compensation    
Exercise price (in dollars per share) $ 1.16  
Maximum [Member]    
Share-based compensation    
Exercise price (in dollars per share) $ 2.25  
Stock Option [Member] | Chief Executive Officer [Member]    
Share-based compensation    
Granted (in shares)   600,000
2011 Equity Incentive Plan [Member]    
Share-based compensation    
Granted (in shares) 258,618  
Non-Qualified Stock Option [Member]    
Share-based compensation    
Granted (in shares) 341,382