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Stockholders' Equity (Deficit) - Summary of Common Shares Reserved for Future Issuance (Detail) - shares	Jun. 30, 2021	Dec. 31, 2020
Class of Stock [Line Items]
Total	9,433,408	7,928,031
Shares Underlying Outstanding Equity Awards [Member]
Class of Stock [Line Items]
Total	6,467,507	6,316,569
Shares Available For Future Equity Award Grants [Member]
Class of Stock [Line Items]
Total	2,930,614	1,506,806
Shares Underlying Early Exercised Equity Awards [Member]
Class of Stock [Line Items]
Total	35,287	100,263
Shares Underlying ESPP Withholdings [Member]
Class of Stock [Line Items]
Total	0	4,393

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Aggregate number of common shares reserved for future issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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