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Accounts Payable and Accrued Expenses - Schedule of Accounts Payable and Accrued Expenses (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Payables and Accruals [Abstract]    
Accounts payable $ 1,263 $ 515
Accrued research projects 969 549
Accrued professional fees 348 266
Accrued compensation and benefits 708 504
Accrued other 86 112
Total $ 3,374 $ 1,946