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Stockholders' Equity - Stock Options (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 15, 2021
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Number of Options        
Outstanding, beginning balance (in shares)   7,179,375    
Granted (in shares)   365,390    
Canceled (in shares)   0    
Exercised (in shares)   5,000    
Expired/Forfeited (in shares)   (1,639,000)    
Outstanding, ending balance (in shares)   5,900,765   7,179,375
Exercisable (in shares)   1,887,098    
Weighted Average Exercise Price        
Outstanding, beginning balance (in dollars per share)   $ 3.14    
Granted (in dollars per share)   1.86    
Canceled (in dollars per share)   0.00    
Exercised (in dollars per share)   1.38    
Expired/Forfeited (in dollars per share)   5.79    
Outstanding, ending balance (in dollars per share)   2.33   $ 3.14
Exercisable (in dollars per share)   $ 3.56    
Other disclosures        
Outstanding Weighted Average Remaining Contractual Life (in Years)   5 years 11 months 23 days   4 years 11 months 5 days
Exercisable Weighted Average Remaining Contractual Life (in Years)   2 years 6 months 29 days    
Aggregate Intrinsic Value, Outstanding   $ 0   $ 0
Aggregate Intrinsic Value, Exercisable   0    
Employee Stock Option        
Other disclosures        
Compensation expense   158,000 $ 68,000  
Unrecognized compensation expense   $ 119,000    
Weighted average period of recognition   10 months 6 days    
Employee Stock Option | Employee        
Number of Options        
Granted (in shares) 365,390      
Weighted Average Exercise Price        
Granted (in dollars per share) $ 1.86      
Employee Stock Option | Five year expiration        
Stockholders' Equity        
Expiration period   5 years    
Employee Stock Option | Seven year expiration        
Stockholders' Equity        
Expiration period   7 years    
Employee Stock Option | Ten year expiration        
Stockholders' Equity        
Expiration period   10 years