Annual report pursuant to Section 13 and 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)
Dec. 31, 2020
shares
Class Of Stock [Line Items]  
Total reserved shares of common stock 17,130,745
2014 Equity Incentive Plan  
Class Of Stock [Line Items]  
Total reserved shares of common stock 13,545,106
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 950,803