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Stock-Based Compensation - Summary of Recognized Stock-Based Compensation Expense Related to Stock Options Granted to Employees and Directors (Details) - Employee Stock Option - 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, Compensation Cost [Line Items]        
Stock-based compensation expense $ 135,393 $ 39,991 $ 344,712 $ 58,538
Research and development        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Stock-based compensation expense 27,081 5,494 78,780 5,994
General and administrative        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Stock-based compensation expense $ 108,312 $ 34,497 $ 265,932 $ 52,544