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Common Stock - Summary of Reserved Shares of Common Stock on Converted Basis for Future Issuance (Detail) - shares
Dec. 31, 2021
Dec. 31, 2020
Class Of Stock [Line Items]    
Total shares reserved 5,070,476 4,106,321
Options Available for Future Grants    
Class Of Stock [Line Items]    
Total shares reserved 2,688,372 2,415,710
2019 Equity Incentive Plan and 2015 Stock Plan | Options Issued and Outstanding    
Class Of Stock [Line Items]    
Total shares reserved 2,024,681 1,481,100
2019 Equity Incentive Plan | Restricted Stock Units Issued and Outstanding    
Class Of Stock [Line Items]    
Total shares reserved 40,500 56,500
2019 Employee Stock Purchase Plan    
Class Of Stock [Line Items]    
Total shares reserved 316,923 153,011