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Organization and Description of Business - Additional Information (Detail) - USD ($) $ in Thousands | Aug. 27, 2021 | Aug. 09, 2021 | Sep. 21, 2020 | Dec. 31, 2023 | Dec. 31, 2022
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Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] |  |  |  |  |
Proceeds from private placement |  |  | $ 100,000 |  |
Accumulated deficit |  |  |  | $ 1,757,778 | $ 1,082,028
Initial Public Offering [Member] |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] |  |  |  |  |
Proceeds from issuance of common stock |  |  | $ 822,267 |  |
Conversa Health Inc. [Member] |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] |  |  |  |  |
Effective date of acquisition |  | Aug. 09, 2021 |  |  |
Silver Cloud Health Holdings, Inc. [Member] |  |  |  |  |
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] |  |  |  |  |
Effective date of acquisition | Aug. 27, 2021 |  |  |  |

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