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, 2019
shares
Class Of Stock [Line Items]  
Total reserved shares of common stock 14,492,765
2014 Equity Incentive Plan  
Class Of Stock [Line Items]  
Total reserved shares of common stock 12,101,764
2018 Inducement Plan  
Class Of Stock [Line Items]  
Total reserved shares of common stock 1,213,760
2014 Employee Stock Purchase Plan  
Class Of Stock [Line Items]  
Total reserved shares of common stock 1,067,575
Options Granted Outside the Equity Plans  
Class Of Stock [Line Items]  
Total reserved shares of common stock 109,666