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Stock-Based Awards (Details 3) - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2014
General and administrative expense    
Stock-based awards    
Stock-based compensation expense $ 354,119 $ 93,360
Research and development expense    
Stock-based awards    
Stock-based compensation expense $ 429,468 70,796
Stock options    
Stock-based awards    
Unamortized stock-based compensation expense   $ 576,223
Expected weighted average period to be recognized   2 years 3 months 18 days