Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Summary of Common Stock Reserved for Future Issuance (Detail)

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Stockholders' Equity - Summary of Common Stock Reserved for Future Issuance (Detail)
shares in Thousands
Jun. 30, 2018
shares
Equity [Abstract]  
Warrants to purchase common stock 13
Common stock options issued and outstanding 5,528
Common stock authorized for future option grants 818
Common stock authorized for the ESPP 516
Shares issuable upon conversion of convertible note payable 2,846
Total 9,721