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Summary of Company Financial Assets with Maturities of Less Than 90 Days Included in Cash Equivalents (Detail) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Cash and Cash Equivalents [Line Items] |  |
Cash equivalents | $ 786,186 | $ 1,562,358
Money Market Funds [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Cash equivalents | 606,498 | 1,562,358
Commercial Paper [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Cash equivalents | 17,772 |
Government and Government Agency Bonds [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Cash equivalents | 132,059 |
Corporate Bond [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Cash equivalents | $ 29,857 |

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