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Stock-Based Compensation - Summary of Stock Option Activity (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Share-based Payment Arrangement, Additional Disclosure [Abstract]
Number of Shares, Opening Balance	62,827,150
Number of Shares, Granted	1,888,660
Number of Shares, Exercised	(4,710,490)
Number of Shares, Forfeited	(401,930)
Number of Shares, Ending Balance	59,603,390	62,827,150
Exercisable and vested	32,491,554
Weighted Average Exercise Price, Opening Balance	$ 4.55
Weighted Average Exercise Price,Granted	11.04
Weighted Average Exercise Price,Exercised	3.05
Weighted Average Exercise Price,Forfeited	6.35
Weighted Average Exercise Price, Ending Balance	4.86	$ 4.55
Weighted Average Exercise Price, Exercisable and vested	$ 3.47
Weighted Average Remaining Contract Term, December 31, 2020	7 years 8 months 12 days	7 years 9 months 18 days
Weighted Average Remaining Contract Term, March 31, 2021	7 years 8 months 12 days	7 years 9 months 18 days
Weighted Average Remaining Contract Term, Exercisable and vested	6 years 7 months 6 days
Aggregate Intrinsic Value	$ 780.0	$ 1,208.0
Aggregate Intrinsic Value, Exercisable and vested	$ 470.6

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Number of fully vested and expected to vest exercisable options that may be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of share options (or share units) exercised during the current period.

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