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
Jun. 30, 2017
Dec. 31, 2016
Statement of Financial Position [Abstract]    
Accrued compensation $ 1,628 $ 1,839
Accrued pre-clinical and clinical trial expenses 1,360 1,623
Accrued professional fees 364 982
Deferred revenue 207  
Other accruals 33 57
Total accrued liabilities $ 3,592 $ 4,501