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Stockholders' Equity (Deficit) - Summary of Common Shares Reserved for Future Issuance  (Detail) - shares	Mar. 31, 2021	Dec. 31, 2020
Class of Stock [Line Items]
Total	9,556,911	7,928,031
Shares Underlying Outstanding Equity Awards [Member]
Class of Stock [Line Items]
Total	6,308,582	6,316,569
Shares Available For Future Equity Award Grants [Member]
Class of Stock [Line Items]
Total	3,152,910	1,506,806
Shares Underlying Early Exercised Equity Awards [Member]
Class of Stock [Line Items]
Total	76,293	100,263
Shares Underlying ESPP Withholdings [Member]
Class of Stock [Line Items]
Total	19,126	4,393