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Stockholders' Equity (Details 3) - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2014
Jun. 30, 2015
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Stock-based compensation expense $ 10,319,100 $ 797,000 $ 382,300
Research and development [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Stock-based compensation expense 115,500 321,900 11,800
General and administrative [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Stock-based compensation expense $ 10,203,600 $ 475,100 $ 370,500