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Non-Marketable Equity Securities - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 5 Months Ended | 9 Months Ended
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Sep. 30, 2021 | Sep. 30, 2021 | Sep. 30, 2021
Equity Securities, FV-NI, Unrealized Gain (Loss) |  | $ (645) | $ (645)
Other Expense [Member] |  |  |
Equity Securities, FV-NI, Unrealized Gain (Loss) | $ 364 |  |

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