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Share-Based Compensation - Compensation Expense (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation $ 144,180 $ 70,620 $ 1,034,346 $ 413,640
General and administrative        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation 118,754 51,887 957,843 356,024
Research and development        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation $ 25,426 $ 18,733 $ 76,503 $ 57,616