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Share-Based Compensation - Compensation Expense (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation $ 467,203 $ 643,430
General and administrative    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation 390,854 510,679
Research and development    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation $ 76,349 $ 132,751