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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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Description of basis for conversion of convertible common stock.

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-Publisher FASB
-Name Accounting Standards Codification
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Face amount or stated value per share of common stock.

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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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Amount of paid and unpaid cash dividends declared for classes of stock, for example, but not limited to, common and preferred.

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