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Common Stock - Additional Information (Detail) - USD ($) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Common Class A [Member] |  |
Class of Stock [Line Items] |  |
Common stock shares authorized | 500,000,000 | 273,986,920
Common stock par or stated value per share | $ 0.001 | $ 0.001
Common stock conversion basis | one |
Cash dividends | $ 0 |
Common Class B [Member] |  |
Class of Stock [Line Items] |  |
Common stock shares authorized | 14,600,000 | 21,593,607
Common stock par or stated value per share | $ 0.001 | $ 0.001
Cash dividends | $ 0 |

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