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Stockholders' Equity (Deficit) - Summary of Common Shares Reserved for Future Issuance&#160; (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

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- Definition 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 + Details
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