Quarterly report pursuant to Section 13 or 15(d)

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

v3.20.2
Stockholders' Equity - Schedule of Common Stock Reserved for Future Issuance Under Equity Incentive Plans (Detail)
Jun. 30, 2020
shares
Class Of Stock [Line Items]  
Total reserved shares of common stock 16,335,544
2014 Equity Incentive Plan  
Class Of Stock [Line Items]  
Total reserved shares of common stock 14,127,804
2018 Inducement Plan  
Class Of Stock [Line Items]  
Total reserved shares of common stock 1,141,086
2014 Employee Stock Purchase Plan  
Class Of Stock [Line Items]  
Total reserved shares of common stock 1,066,654