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Common Stock - Summary of Reserved Shares of Common Stock for Future Issuance (Detail)
Sep. 30, 2021
shares
Class Of Stock [Line Items]  
Total shares reserved 5,111,841
2019 Equity Incentive Plan and 2015 Stock Plan | Options Issued and Outstanding  
Class Of Stock [Line Items]  
Total shares reserved 1,982,298
2019 Equity Incentive Plan | Restricted Stock Units Issued and Outstanding  
Class Of Stock [Line Items]  
Total shares reserved 40,500
2019 Equity Incentive Plan | Options Available for Future Grants  
Class Of Stock [Line Items]  
Total shares reserved 2,746,829
2019 Employee Stock Purchase Plan  
Class Of Stock [Line Items]  
Total shares reserved 342,214