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Stockholders' Equity - Warrants (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Other disclosures    
Compensation expense $ 200,000 $ 500,000
Five year expiration    
Stockholders' Equity    
Expiration period 5 years  
Seven year expiration    
Stockholders' Equity    
Expiration period 7 years  
Ten year expiration    
Stockholders' Equity    
Expiration period 10 years  
Warrant    
Number of Other than Options    
Outstanding and exercisable, beginning balance (in shares) 579,815  
Outstanding and exercisable, ending balance (in shares) 579,815 579,815
Weighted Average Exercise Price    
Outstanding, beginning balance (in dollars per share) $ 4.63  
Outstanding, ending balance (in dollars per share) $ 4.63 $ 4.63
Weighted Average Remaining Contractual Life (in Years), Outstanding and exercisable 1 year 3 months 26 days 2 years 3 months 26 days
Other disclosures    
Compensation expense $ 0 $ 14,000
Warrant | Five year expiration    
Stockholders' Equity    
Expiration period 5 years