v3.21.1

Restatement of previously issued financial statements - Summary of impact of the restatement on the balance sheets, statements of operations and statements of cash flows (Parenthetical) (Detail) - $ / shares	Dec. 31, 2020	Sep. 30, 2020
Restatement of Previously Issued Financial Statements [Line Items]
Preferred stock par value	$ 0.0001	$ 0.0001
Common stock par value	0.0001
As Previously Reported [Member]
Restatement of Previously Issued Financial Statements [Line Items]
Preferred stock par value	0.0001
Restatement Adjustment [Member]
Restatement of Previously Issued Financial Statements [Line Items]
Preferred stock par value	0.0001
Common Class A [Member]
Restatement of Previously Issued Financial Statements [Line Items]
Temporary equity redemption price per share	10.00
Common stock par value	0.0001	0.0001
Common Class A [Member] | As Previously Reported [Member]
Restatement of Previously Issued Financial Statements [Line Items]
Temporary equity redemption price per share	0.0001
Common Class A [Member] | Restatement Adjustment [Member]
Restatement of Previously Issued Financial Statements [Line Items]
Temporary equity redemption price per share	0.0001
Common stock par value	0.0001
Common Class B [Member]
Restatement of Previously Issued Financial Statements [Line Items]
Common stock par value	0.0001	$ 0.0001
Common Class B [Member] | Restatement Adjustment [Member]
Restatement of Previously Issued Financial Statements [Line Items]
Common stock par value	0.0001
Common Stock Class F [Member]
Restatement of Previously Issued Financial Statements [Line Items]
Common stock par value	0.0001
Common Stock Class F [Member] | Restatement Adjustment [Member]
Restatement of Previously Issued Financial Statements [Line Items]
Common stock par value	$ 0.0001

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Face amount or stated value per share of common stock.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.

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Amount to be paid per share that is classified as temporary equity by entity upon redemption. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 480
-SubTopic 10
-Section S99
-Paragraph 1
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