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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 [Member] - USD ($)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]    
Stock-based compensation expense $ 97,968 $ 9,124
Research and Development [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]    
Stock-based compensation expense 24,703 0
General and Administrative Expense [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]    
Stock-based compensation expense $ 73,265 $ 9,124