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Stock-Based Compensation - Restricted Stock Granted to Non-Employees - Employment Agreement (Details) - Employee - Restricted Stock - USD ($)
1 Months Ended 9 Months Ended
Jan. 31, 2016
Sep. 30, 2016
Sep. 30, 2015
Stock-Based Compensation      
Shares granted (in shares) 1,750,794    
Shares vested (in shares) 1,750,794    
Research and development expenses      
Stock-Based Compensation      
Aggregate stock-based compensation expense   $ 10,370,762 $ 8,690,824