Quarterly report pursuant to Section 13 or 15(d)

Certain Balance Sheet Items - Accrued Liabilities (Detail)

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Certain Balance Sheet Items - Accrued Liabilities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Statement of Financial Position [Abstract]    
Accrued compensation $ 1,205 $ 1,504
Accrued pre-clinical and clinical trial expenses 2,365 1,732
Accrued professional fees 415 73
Other accruals 32 79
Total accrued liabilities $ 4,017 $ 3,388