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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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Common stock earnout shares.

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Total number of shares of other common stock instruments held by shareholders, such as exchangeable shares. May be all or portion of the number of common shares authorized.

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- Definition

Number of common stock held in a trust that has been set up specifically to accumulate stock for the sole purpose of distribution to participating employees but not yet earned.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 40
-Section 25
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=109244457&loc=d3e16701-113920

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Number of shares of common stock subject to repurchase or cancellation determined by relating the portion of time within a reporting period that these shares have been outstanding to the total time in that period. Common stock subject to repurchase are outstanding common shares that are contingently returnable (that is, subject to recall).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=125511455&loc=d3e2646-109256

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