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Income Taxes - Summary of Reconciliation of U.S. Federal Statutory Income Tax Rate and Effective Income Tax Rate (Detail)	1 Months Ended	3 Months Ended		8 Months Ended	9 Months Ended	11 Months Ended	12 Months Ended
	Jan. 31, 2020	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2020	Sep. 30, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2017
Effective Income Tax Rate Reconciliation, Percent [Abstract]
U.S. federal statutory rate	21.00%	21.00%	21.00%	21.00%	21.00%	21.00%	21.00%	35.00%
State and local income taxes – net of federal tax benefits	(0.99%)					(1.50%)	4.84%
Foreign rate difference	0.06%					(0.14%)	1.28%
Change in valuation allowance	(12.37%)					(0.00%)	(13.81%)
GILTI inclusion	(0.34)					2.71	3.41
Transaction cost	(3.14%)					(1.09%)	0.00%
Share-based compensation	(2.23%)					(0.40%)	0.47%
Rate change impact	0.00%					0.00%	1.37%
US research and development credit	0.35%					0.85%	(2.03%)
Withholding tax	0.00%					(1.90%)	0.78%
Other nondeductible items	(0.01%)					(0.24%)	(0.60%)
Effective rate	2.33%	17.30%	45.60%	21.40%	75.30%	19.29%	16.71%

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

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