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Equity - Non-Option Incentive (Details) - USD ($)
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Weighted Average Grant Date Fair Value Per Share - Non-option    
Compensation expense $ 429,000 $ 52,000
KELTIP Units    
Number of Shares - Non-option    
Outstanding at beginning of year (in shares) 3,725,000  
Outstanding at end of year (in shares) 4,205,000  
Equity Plan | Restricted Stock    
Number of Shares - Non-option    
Outstanding at beginning of year (in shares) 224,002  
Granted during the year (in shares)  
Restrictions lifted during the year (in shares)  
Forfeited during the year (in shares)  
Outstanding at end of year (in shares) 224,002  
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)  
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) $ 0.36  
Compensation expense $ 13,000  
Additional compensation expense expected to be recognized $ 45,000  
Period for future recognition of additional compensation expense 16 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)  
Restrictions lifted during the year (in shares)  
Forfeited during the year (in shares)  
Outstanding at end of year (in shares) 3,610,038  
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)  
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  
Compensation expense $ 47,000  
Additional compensation expense expected to be recognized $ 41,000  
Period for future recognition of additional compensation expense 3 months  
Number of unrestricted shares Director to receive for vested RSU upon termination from board 1  
KELTIP    
Number of Shares - Non-option    
Granted during the year (in shares) 480,000 0
Weighted Average Grant Date Fair Value Per Share - Non-option    
Compensation expense $ 400,000