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Stockholders' Equity - Warrants (Details) - Warrant - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Number of Other than Options          
Outstanding and exercisable, beginning balance (in shares)     579,815    
Granted (in shares)     0    
Canceled (in shares)     0    
Exercised (in shares)     0    
Expired/Forfeited (in shares)     0    
Outstanding and exercisable, ending balance (in shares) 579,815   579,815   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)     0    
Outstanding and exercisable, ending balance (in dollars per share) $ 4.63   $ 4.63   $ 4.63
Weighted Average Remaining Contractual Life (in Years), Outstanding and exercisable     9 months 25 days   1 year 3 months 25 days
Aggregate Intrinsic Value, Outstanding and exercisable $ 0   $ 0   $ 0
Other disclosures          
Compensation expense $ 0 $ 0 $ 0 $ 0  
Five year expiration          
Stockholders' Equity          
Expiration period     5 years    
Ten year expiration          
Stockholders' Equity          
Expiration period     10 years