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Equity Plans and Stock-Based Compensation - Additional Information (Detail) - shares | 9 Months Ended |
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Sep. 30, 2022 | May 31, 2022
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Increase in aggregate number of shares of common stock authorized for issuance |  | 15,000,000
Employee Stock Option |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Options vesting period | 7 years |
2018 Equity Incentive Plan |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Newly reserved shares of common stock | 15,475,258 |
2014 Employee Stock Purchase Plan | Maximum |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Shares issued to employees |  | 32,600,000

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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + 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 https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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