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Equity - Stock Grants (Details) - USD ($)
 1 Months Ended 12 Months Ended
May 31, 2018
Dec. 31, 2018
Dec. 31, 2019
Share-based compensation      
Shares issued for board service ($1.85 per share) $ 212,000 $ 212,000  
Shares issued for board service ($1.85 per share) (in shares) 114,865    
Common stock, par value (in dollars per share)   $ 0.0001 $ 0.0001
Common Stock      
Share-based compensation      
Shares issued for board service ($1.85 per share)   $ 0  
Shares issued for board service ($1.85 per share) (in shares)   114,865