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Condensed Consolidated Statements of Operations and Comprehensive Loss (USD $)
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Operating expenses:    
Research and development $ 3,368,999 $ 645,110
General and administrative 1,923,623 707,037
Total operating expenses 5,292,622 1,352,147
Operating loss (5,292,622) (1,352,147)
Other income, net 25,466 525
Loss before income tax expense (5,267,156) (1,351,622)
Income tax expense 0 (112)
Net loss (5,267,156) (1,351,734)
Basic loss per share attributable to common stock (in dollars per share) $ (0.41) $ (0.30)
Weighted average common shares outstanding, basic (in shares) 12,728,086 4,455,790
Diluted loss per share attributable to common stock (in dollars per share) $ (0.41) $ (0.30)
Weighted average common shares outstanding, diluted (in shares) 12,728,086 4,455,790
Comprehensive loss $ (5,267,156) $ (1,351,734)