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)
Jun. 30, 2021
shares
Class Of Stock [Line Items]  
Total reserved shares of common stock 20,293,665
2014 Equity Incentive Plan  
Class Of Stock [Line Items]  
Total reserved shares of common stock 16,773,438
2018 Inducement Plan  
Class Of Stock [Line Items]  
Total reserved shares of common stock 2,547,962
2014 Employee Stock Purchase Plan  
Class Of Stock [Line Items]  
Total reserved shares of common stock 972,265