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, 2018
Dec. 31, 2017
Statement Of Financial Position [Abstract]    
Accrued compensation $ 1,296 $ 2,416
Accrued professional fees 539 288
Other 236 124
Total other accrued liabilities $ 2,071 $ 2,828