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Equity Incentive Plans - Summary of Company stock Option Activity (Detail) - 2011 Plan and 2021 Plan $ / shares in Units, $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 USD ($) $ / shares shares | Dec. 31, 2020 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract] |  |
Shares Available for Grant | 5,331,595 | 451,670
Shares Available for Grant, Forfeited/cancelled | 107,128 |
Shares Available for Grant | 451,670 |
Shares Available for Grant, Granted | (2,487,203) |
Shares Available for Grant, Additional shares reserved | 7,260,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |
Number of Shares | 3,137,776 |
Number of Shares, Granted | 2,487,203 |
Number of Shares, Forfeited/cancelled | (107,128) |
Number of Shares, Exercised/released | (264,882) |
Number of Shares | 5,252,969 | 3,137,776
Number of Shares Vested and exercisable as of September 30, 2021 | 2,054,954 |
Number of Shares, Vested and expected to vest as of Septmeber 30, 2021 | 5,222,969 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] |  |
Weighted-Average Exercise Price | $ / shares | $ 0.94 |
Weighted-Average Exercise Price, Granted | $ / shares | 11.13 |
Weighted-Average Exercise Price, Forfeited/cancelled | $ / shares | 2.89 |
Weighted-Average Exercise Price, Exercised/released | $ / shares | 1.01 |
Weighted-Average Exercise Price | $ / shares | 5.72 | $ 0.94
Weighted-Average Exercise Price, Vested and exercisable as of September 30, 2021 | $ / shares | 1.46 |
Weighted-Average Exercise Price, Expected to vest as of September 30, 2021 | $ / shares | $ 5.75 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term |  |
Weighted Average Remaining Contractual Term | 7 years 7 months 6 days | 6 years 9 months 18 days
Weighted average contractual term, vested and exercisable | 5 years 2 months 12 days |
Weighted average contractual term, vested and expected | 7 years 8 months 12 days |
Average Intrinsic Value | $ | $ 89,340 | $ 18,656
Average Intrinsic Value, Vested and exercisable as of September 30, 2021 | $ | 43,650 |
Average Intrinsic Value, Vested and expected as of September 30, 2021 | $ | $ 88,662 |

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- Definition Share-based compensation arrangement by share-based payment award, number of shares available for grant, granted in period. + References No definition available. + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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