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Stockholders' Equity - Sales of Securities (Details) - USD ($)
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Jan. 25, 2021
Jun. 12, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Proceeds from sale of securities $ 46,544,688 $ 25,740,293    
At the Market (ATM) Offering [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Sale of stock, price per share (per share) $ 4.16      
Common stock, capital shares reserved for future issuance (shares)       40,000,000
Sale of stock, number of shares issued in transaction 11,186,084      
2020 and 2021 Sales Agreements        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Sale of stock, price per share (per share) $ 2.88      
Proceeds from issuance or sale of equity $ 74,999,784      
Sale of stock, number of shares issued in transaction 26,005,824      
2021 Sales Agreement        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common stock, capital shares reserved for future issuance (shares)     35,000,000  
ATM Sales Agreement June 2021 Sales Agreement        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common stock, capital shares reserved for future issuance (shares) 100,000,000