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Stock-Based Compensation - Summary of Restricted Stock Units Activity (Detail)	3 Months Ended
	Mar. 31, 2021 $ / shares shares
Share-based Payment Arrangement [Abstract]
Number of Shares, Opening Balance | shares	32,556,160
Number of Shares, Granted | shares	18,088,710
Number of Shares, Vested and converted to common stock | shares	0
Number of Shares, Forfeited | shares	(371,945)
Number of Shares, Ending Balance | shares	50,272,925
Weighted Average Grant Date Fair Value, Opening Balance | $ / shares	$ 6.75
Weighted Average Grant Date Fair Value, Granted | $ / shares	12.61
Weighted Average Grant Date Fair Value, Vested and converted to common stock | $ / shares	0
Weighted Average Grant Date Fair Value, Forfeited | $ / shares	11.80
Weighted Average Grant Date Fair Value, Ending Balance | $ / shares	$ 8.82

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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