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Accrued Liabilities - Accrued Liabilities (Detail) (USD $)
Mar. 31, 2014
Dec. 31, 2013
Payables And Accruals [Abstract]    
Accrued R&D agreements and study expenses $ 3,552,026 $ 2,273,860
Accrued acquisition costs 295,325 44,640
Other accrued liabilities 95,544 176,588
Total accrued liabilities $ 3,942,895 $ 2,495,088