Quarterly report pursuant to Section 13 or 15(d)

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

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Stockholders' Equity - Schedule of Common Stock Reserved for Future Issuance Under Equity Incentive Plans (Detail)
Sep. 30, 2020
shares
Class Of Stock [Line Items]  
Total reserved shares of common stock 17,505,050
2014 Equity Incentive Plan  
Class Of Stock [Line Items]  
Total reserved shares of common stock 13,803,560
2018 Inducement Plan  
Class Of Stock [Line Items]  
Total reserved shares of common stock 2,634,836
2014 Employee Stock Purchase Plan  
Class Of Stock [Line Items]  
Total reserved shares of common stock 1,066,654