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Balance Sheet Components - Summary of Prepaid Expenses and Other Current Assets (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Prepaid Expense and Other Assets, Current [Abstract] |  |
Prepaid clinical and research related expenses | $ 2,488 | $ 1,253
Other | 906 | 305
Prepaid expenses and other current assets | $ 3,394 | $ 1,558

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- Definition Prepaid manufacturing of clinical materials. + References No definition available. + Details
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