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Accrued and Other Liabilities - Schedule of Accrued Liabilities and Other Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Payables and Accruals [Abstract]    
Accrued clinical trial expenses $ 6,694 $ 311
Accrued contract manufacturing 2,705 289
Accrued professional and consulting services 322 272
AstraZeneca clinical trial material accrual   1,328
Other 684 380
Accrued liabilities and other liabilities $ 10,405 $ 2,580