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)
Sep. 30, 2017
shares
Equity [Abstract]  
Warrants to purchase common stock 149,704
Common stock options issued and outstanding 4,910,557
Common stock authorized for future option grants 545,503
Common stock authorized for the ESPP 544,578
Shares issuable upon conversion of convertible note payable 2,297,138
Total 8,447,480