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Stockholders' Equity - Stock-Based Compensation Expense (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Stock-based compensation expense        
Total stock-based compensation expense $ 771,687 $ 458,230 $ 1,499,233 $ 1,045,744
Research and Development        
Stock-based compensation expense        
Total stock-based compensation expense 257,998 178,367 511,280 381,274
General and Administrative Expense        
Stock-based compensation expense        
Total stock-based compensation expense $ 513,689 $ 279,863 $ 987,953 $ 664,470