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Equity - Non-Option Incentive (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Number of Shares - Non-option        
Number of employees shares were granted     9  
Allocated Share-based Compensation Expense $ 987,000 $ 614,000 $ 1,416,000 $ 666,000
Restriction lifted grants made in current year(in shares)     84,002  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage     1.00%  
Number of employees share based payment arrangement     6  
Share-based Compensation Arrangement by Share-based Payment Award, Right To Receive Unrestricted Common Shares In Exchange For Vested Awards Upon Termination Of Agreement, Number     1  
Weighted Average Grant Date Fair Value Per Share - Non-option        
Compensation expense $ 987,000 $ 614,000 $ 1,416,000 $ 666,000
Percentage of awards which will vest on each of the first, second and third anniversaries of the grant date     1.00%  
Restricted Stock Units (RSUs)        
Number of Shares - Non-option        
Allocated Share-based Compensation Expense     $ 67,000  
Weighted Average Grant Date Fair Value Per Share - Non-option        
Compensation expense     $ 67,000  
Restricted Stock Units (RSUs) | Consultant        
Number of Shares - Non-option        
Granted during the year (in shares)     100,000  
KELTIP Units        
Number of Shares - Non-option        
Outstanding at beginning of year (in shares)     3,725,000  
Granted during the year (in shares)       1,400,000
Allocated Share-based Compensation Expense       $ 500,000
Outstanding at end of year (in shares) 5,330,000   5,330,000  
Weighted Average Grant Date Fair Value Per Share - Non-option        
Compensation expense       $ 500,000
Equity Plan | Restricted Stock        
Number of Shares - Non-option        
Outstanding at beginning of year (in shares)     224,002  
Granted during the year (in shares)     335,000  
Restrictions lifted during the year (in shares)     (195,668)  
Forfeited during the year (in shares)      
Allocated Share-based Compensation Expense     $ 113,000  
Outstanding at end of year (in shares) 363,334   363,334  
Weighted Average Grant Date Fair Value Per Share - Non-option        
Outstanding at beginning of year (in dollars per share)     $ 0.36  
Granted during the year (in dollars per share)     0.67  
Restrictions lifted during the year (in dollars per share)     0.49  
Forfeited during the year (in dollars per share)      
Outstanding at end of year (in dollars per share) $ 0.57   $ 0.57  
Compensation expense     $ 113,000  
Additional compensation expense expected to be recognized $ 169,000   $ 169,000  
Period for future recognition of additional compensation expense     24 months  
Deferred Compensation Plan | Restricted Stock Units (RSUs)        
Number of Shares - Non-option        
Outstanding at beginning of year (in shares)     3,610,038  
Granted during the year (in shares)     300,000  
Restrictions lifted during the year (in shares)      
Forfeited during the year (in shares)      
Allocated Share-based Compensation Expense     $ 113,000  
Outstanding at end of year (in shares) 3,910,038   3,910,038  
Weighted Average Grant Date Fair Value Per Share - Non-option        
Outstanding at beginning of year (in dollars per share)     $ 0.70  
Granted during the year (in dollars per share)     0.67  
Restrictions lifted during the year (in dollars per share)      
Forfeited during the year (in dollars per share)      
Outstanding at end of year (in dollars per share) $ 0.70   $ 0.70  
Compensation expense     $ 113,000  
Additional compensation expense expected to be recognized $ 175,000   $ 175,000  
Period for future recognition of additional compensation expense     12 months  
Number of unrestricted shares Director to receive for vested RSU upon termination from board     1  
Deferred Compensation Plan | Restricted Stock Units (RSUs) | Board Members [Member]        
Number of Shares - Non-option        
Granted during the year (in shares)     50,000  
KELTIP        
Number of Shares - Non-option        
Granted during the year (in shares)     1,605,000  
Allocated Share-based Compensation Expense     $ 1,000,000.0  
Weighted Average Grant Date Fair Value Per Share - Non-option        
Compensation expense     $ 1,000,000.0  
Restricted Stock | Employee Stock Option        
Weighted Average Grant Date Fair Value Per Share - Non-option        
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures     335,000