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Equity - Inducement Stock Options - Valuation assumptions (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Inducement Stock Options [Member]        
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 $ 39,000   39,000  
Compensation expense $ 13,000 $ 26,000 $ 26,000 $ 85,000
Inducement Stock Options [Member] | Minimum [Member]        
Share-based compensation        
Exercise price (in dollars per share)     $ 1.16  
Inducement Stock Options [Member] | Maximum [Member]        
Share-based compensation        
Exercise price (in dollars per share)     $ 2.25  
Stock Option [Member] | Chief Executive Officer [Member] | Inducement Stock Options [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] | Inducement Stock Options [Member]        
Share-based compensation        
Granted (in shares)     341,382