Summary of Significant Accounting Policies - Summary of basic and diluted net income per ordinary share (Detail) - USD ($)	3 Months Ended			4 Months Ended	6 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Jun. 30, 2020	Sep. 30, 2021	Dec. 31, 2020
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Allocation of net loss				$ (22,966)			$ (10,506,796)
Common Class A [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Weighted-average shares outstanding			14,413,333	0	21,043,094	23,252,747	24,348,493
Basic and diluted net loss per share	$ (0.33)	$ 0.04	$ 0.42	$ 0	$ 0.37	$ (0.03)	$ (0.34)
Common Class A [Member] | Subject To Possible Redemption [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Allocation of net loss				$ 0			$ (8,186,784)
Weighted-average shares outstanding				0			24,348,493
Basic and diluted net loss per share				$ 0			$ (0.34)
Common Class B [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Weighted-average shares outstanding			6,900,000	6,000,000	6,900,000	6,900,000	6,900,000
Basic and diluted net loss per share	$ (0.33)	$ 0.04	$ 0.42	$ 0.00	$ 0.37	$ (0.03)	$ (0.34)
Common Class B [Member] | Subject To Possible Redemption [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Allocation of net loss				$ (22,966)			$ (2,320,012)
Weighted-average shares outstanding				6,000,000			6,900,000
Basic and diluted net loss per share				$ 0.00			$ (0.34)