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Equity - Non-Option Incentive (Details)
3 Months Ended
Feb. 26, 2019
USD ($)
employee
shares
Mar. 31, 2020
USD ($)
$ / shares
shares
Mar. 31, 2019
USD ($)
Weighted Average Grant Date Fair Value Per Share - Non-option      
Compensation expense | $   $ 52,000 $ 564,000
Modification of previously awarded KELTIP Units | $     $ 583,000
KELTIP Units | Officers      
Number of Shares - Non-option      
Granted during the year (in shares) | shares 705,000    
Weighted Average Grant Date Fair Value Per Share - Non-option      
Number of employees | employee 2    
Equity Plan | Restricted Stock      
Number of Shares - Non-option      
Outstanding at beginning of year (in shares) | shares   318,003  
Outstanding at end of year (in shares) | shares   318,003  
Weighted Average Grant Date Fair Value Per Share - Non-option      
Outstanding at beginning of year (in dollars per share) | $ / shares   $ 0.45  
Outstanding at end of year (in dollars per share) | $ / shares   $ 0.45  
Compensation expense | $   $ 17,000  
Additional compensation expense expected to be recognized | $   $ 45,000  
Period for future recognition of additional compensation expense   15 months  
Deferred Compensation Plan | Restricted Stock Units (RSUs)      
Number of Shares - Non-option      
Outstanding at beginning of year (in shares) | shares   2,830,038  
Outstanding at end of year (in shares) | shares   2,830,038  
Weighted Average Grant Date Fair Value Per Share - Non-option      
Outstanding at beginning of year (in dollars per share) | $ / shares   $ 0.78  
Outstanding at end of year (in dollars per share) | $ / shares   $ 0.78  
Compensation expense | $   $ 35,000  
Additional compensation expense expected to be recognized | $   $ 21,000  
Period for future recognition of additional compensation expense   3 months  
Number of unrestricted shares Director to receive for vested RSU upon termination from board | shares   1  
KELTIP      
Number of Shares - Non-option      
Outstanding at beginning of year (in shares) | shares   2,325,000  
Granted during the year (in shares) | shares   0  
Outstanding at end of year (in shares) | shares   2,325,000  
KELTIP | KELTIP Units | Officers      
Weighted Average Grant Date Fair Value Per Share - Non-option      
Compensation expense | $ $ 254,000    
Additional compensation expense | $ 227,000    
Modification of previously awarded KELTIP Units | $ $ 583,000