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Basic and Diluted Net Loss Per Share - Narrative (Detail) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 shares | Sep. 30, 2021 shares
Earnings Per Share [Abstract] |  |
Weighted-average sponsor vesting shares subject to return (in shares) | 4,500,000 | 1,615,385
Shares of common stock (in shares) | 1,481,531 | 1,481,531
Earnout shares of common stock outstanding (in shares) | 25,000,000 | 25,000,000
Sponsor vesting shares of common stock outstanding (in shares) | 4,500,000 | 4,500,000

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