Common Stock - Summary of Reserved Shares of Common Stock on Converted Basis for Future Issuance (Detail) - shares	Dec. 31, 2022	Dec. 31, 2021
Class Of Stock [Line Items]
Total shares reserved	10,338,814	5,070,476
Options Available for Future Grants
Class Of Stock [Line Items]
Total shares reserved	2,820,341	2,688,372
Pre-funded warrants issued and outstanding
Class Of Stock [Line Items]
Total shares reserved	4,000,000
2019 Equity Incentive Plan and 2015 Stock Plan | Options Issued and Outstanding
Class Of Stock [Line Items]
Total shares reserved	2,993,280	2,024,681
2019 Equity Incentive Plan | Restricted Stock Units Issued and Outstanding
Class Of Stock [Line Items]
Total shares reserved	27,000	40,500
2019 Employee Stock Purchase Plan
Class Of Stock [Line Items]
Total shares reserved	498,193	316,923