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Stockholders' Equity - Stock Options (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Other disclosures      
Compensation expense $ 30,000.00 $ 160,000  
Employee      
Other disclosures      
Compensation expense 10,000.00 140,000  
Non Management Directors      
Other disclosures      
Compensation expense $ 20,000.00 20,000.00  
Employee Stock Option      
Number of Options      
Outstanding, beginning balance (in shares) 5,630,970    
Granted (in shares) 0    
Canceled (in shares) 0    
Exercised (in shares) 0    
Expired/Forfeited (in shares) (364,310)    
Outstanding, ending balance (in shares) 5,266,660   5,630,970
Exercisable (in shares) 1,495,826    
Weighted Average Exercise Price      
Outstanding, beginning balance (in dollars per share) $ 2.25    
Granted (in dollars per share) 0    
Canceled (in dollars per share) 0    
Exercised (in dollars per share) 0    
Expired/Forfeited (in dollars per share) 3.61    
Outstanding, ending balance (in dollars per share) 2.16   $ 2.25
Exercisable (in dollars per share) $ 3.32    
Other disclosures      
Outstanding Weighted Average Remaining Contractual Life (in Years) 5 years 6 months 7 days   5 years 5 months 15 days
Exercisable Weighted Average Remaining Contractual Life (in Years) 1 year 11 months 4 days    
Aggregate Intrinsic Value, Outstanding $ 0   $ 0
Aggregate Intrinsic Value, Exercisable 0    
Compensation expense 20,000.00 $ 160,000  
Unrecognized compensation expense $ 70,000.00    
Weighted average period of recognition 1 year 25 days