Quarterly report pursuant to Section 13 or 15(d)

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

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Stockholders' Equity - Schedule of Common Stock Reserved for Future Issuance (Detail)
Sep. 30, 2018
shares
Class Of Stock [Line Items]  
Total reserved shares of common stock 12,992,937
2014 Equity Incentive Plan  
Class Of Stock [Line Items]  
Total reserved shares of common stock 10,540,933
2018 Inducement Plan  
Class Of Stock [Line Items]  
Total reserved shares of common stock 1,250,000
2014 Employee Stock Purchase Plan  
Class Of Stock [Line Items]  
Total reserved shares of common stock 943,338
Options Granted Outside the Equity Plans  
Class Of Stock [Line Items]  
Total reserved shares of common stock 258,666