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Stockholders' Equity - Warrants (Details) - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Other disclosures    
Compensation expense $ 720,000 $ 850,000
Warrant    
Number of Other than Options    
Outstanding and exercisable, beginning balance (in shares) 579,815  
Granted (in shares) 0 0
Canceled (in shares) 0  
Exercised (in shares) 0  
Expired/Forfeited (in shares) 463,750  
Outstanding and exercisable, ending balance (in shares) 116,065 579,815
Weighted Average Exercise Price    
Outstanding and exercisable, beginning balance (in dollars per share) $ 4.63  
Granted (in dollars per share) 0  
Canceled (in dollars per share) 0  
Exercised (in dollars per share) 0  
Expired/Forfeited (in dollars per share) 5.00  
Outstanding and exercisable, ending balance (in dollars per share) $ 3.15 $ 4.63
Weighted Average Remaining Contractual Life (in Years), Outstanding and exercisable 2 years 6 months 25 days 1 year 3 months 25 days
Aggregate Intrinsic Value, Outstanding and exercisable $ 0 $ 0
Other disclosures    
Compensation expense $ 0 $ 0
Warrant | Five year expiration    
Stockholders' Equity    
Expiration period 5 years  
Warrant | Seven year expiration    
Stockholders' Equity    
Expiration period 7 years  
Warrant | Ten year expiration    
Stockholders' Equity    
Expiration period 10 years