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Stockholders' Equity - Series D Convertible Preferred Stock (Details) - USD ($)
 1 Months Ended
Jun. 15, 2020
May 08, 2020
Jan. 25, 2019
Jun. 30, 2020
Apr. 30, 2019
Dec. 31, 2020
Dec. 31, 2019
Class of Stock [Line Items]              
Number of shares called by warrants (in shares) 2,213,115            
Exercise price of warrants (in dollars per share) $ 3.05         $ 0.01  
Conversion of stock, shares issued (in shares)       1,546,700 333,333    
Service receivable     $ 1,675,000     $ 2,171,258 $ 971,673
Deemed dividend recognized on beneficial conversion features of convertible preferred stock $ 2,700,000            
Months until exercisable 6 months 6 months          
Series D Convertible Preferred Stock              
Class of Stock [Line Items]              
Shares converted (in shares)       154,670      
Service receivable   $ 2,300,000          
Deemed dividend recognized on beneficial conversion features of convertible preferred stock   600,000          
Private Placement              
Class of Stock [Line Items]              
Amount financed under agreement   $ 2,300,000 $ 1,675,000        
Number of shares called by warrants (in shares)   859,813          
Exercise price of warrants (in dollars per share)   $ 1.50 $ 3.762        
Private Placement | Common Stock              
Class of Stock [Line Items]              
Stock issued (in shares)   602,833 183,334        
Private Placement | Series D Convertible Preferred Stock              
Class of Stock [Line Items]              
Stock issued (in shares)   154,670