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Stockholders' Equity - Stock-Based Compensation Expense (Detail) - USD ($)
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Stock-based compensation expense    
Total stock-based compensation expense $ 842,847 $ 727,547
Research and Development    
Stock-based compensation expense    
Total stock-based compensation expense 311,783 253,282
General and Administrative Expense    
Stock-based compensation expense    
Total stock-based compensation expense $ 531,064 $ 474,265