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percentage of estimated fair value of the common stock

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Percentage of ownership.

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Settlement of employee loan.

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Share based compensation arrangement by share-based payment award accelerated vesting for change in control award vesting rights percentage.

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Share based compensation arrangement exercise price per share.

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Share-based compensation arrangement by share-based payment award, plan modification.

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Decrease for amounts of indebtedness forgiven by the holder of the debt instrument.

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

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

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Stock-Based Compensation - Additional Information (Detail) $ / shares in Units, $ in Thousands					1 Months Ended			9 Months Ended	12 Months Ended
	Dec. 31, 2020 USD ($) shares	Sep. 30, 2020 shares	Aug. 30, 2020 shares	Aug. 06, 2020 USD ($) shares	Jun. 30, 2020 USD ($) $ / shares shares	Sep. 30, 2018 $ / shares	Nov. 30, 2016 USD ($) shares	Sep. 30, 2020 USD ($) shares	Dec. 31, 2020 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares
Common shares issuable upon full vesting of the growth units \| shares				1,500,000
Cumulative stock-based compensation expense									$ 1,270,702	$ 241,970	$ 248,503
Percentage of outstanding stock maximum									0.00%
Options granted in period \| shares									397,885,337
Unrecognized share based compensation expense	$ 1,100,000								$ 1,100,000
Unrecognized share based compensation expense, period for recognition									8 years 21 days
Non option equity instruments outstanding \| shares	3,582,674								3,582,674
Stock-based compensation									$ 1,270,702	241,970	248,503
Share based compensation by share based payment arrangement aggregate intrinsic value of stock options excercised during the period									$ 974,200	$ 90,700	$ 49,000
Share based compensation by share based payment arrangement weighted average grant date fair value of stock options granted during the period \| $ / shares									$ 2.57	$ 3.67	$ 3.81
Share based compensation by share based payment arrangement total grant date fair value of stock options vested during the period									$ 214,700	$ 229,400	$ 221,200
Income tax benefit									(12,636)	12,375	9,102
Stock Based Compensation Expense
Income tax benefit									$ 18,200	$ 6,400	6,000
2020 Executive Equity Incentive Plan [Member]
Shares reserved for future issuance \| shares				165,900,000
Options granted in period \| shares				162,000,000
2020 Extended Exercisability [Member]
Share based compensation arrangement by share based payment award plan modification \| shares									57,659,626
Share based payment award expiration period and option contractual term									5 months 19 days
Share-based payment arrangement, plan modification, incremental cost									$ 9,900
2019 Extended Exercisability [Member]
Share based compensation arrangement by share based payment award plan modification \| shares										26,040,393
Share based payment award expiration period and option contractual term										10 months 24 days
Share-based payment arrangement, plan modification, incremental cost										$ 5,600
2010 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Accelerated Vesting For Change in Control, Award Vesting Rights, Percentage									0.25
2020 Equity Incentive Plan [Member]
Percentage of ownership	10.00%								10.00%
Shares reserved for future issuance \| shares		150,000,000						150,000,000
Share based payment award expiration period and option contractual term									5 years
Employee Director [Member]
Payments related to tax withholding									$ 800
Due to employees director current	$ 4,000								4,000
Stock-based compensation									4,500
Employee Director [Member] \| Non Recourse Promissory Notes [Member]
Percentage of fixed interest							1.50%
Debt instrument, face amount							$ 25,900
Settlement of Employee Loan				$ 26,600
Stock repurchased and retired during period, shares \| shares				3,500,000
Debt instrument decrease forgiveness				$ 800
Employee Director [Member] \| Non Recourse Promissory Notes [Member] \| Pledged Collateral [Member]
Number of common stock held as collateral \| shares							10,500,000
June 2020 Reprice [Member]
Share-based payment arrangement, plan modification, incremental cost	$ 22,900				$ 74,000				8,300
Number of shares repriced \| shares					235,885,337
Remaining contractual term of repriced options					10 years
June 2020 Reprice [Member] \| Exercise Price of Repriced Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Plan Modification, Description and Term \| $ / shares					$ 4.72
Two Thousand And Eighteen Reprice [Member]
Remaining contractual term of repriced options						10 years
Two Thousand And Eighteen Reprice [Member] \| Exercise Price of Repriced Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Plan Modification, Description and Term \| $ / shares						$ 6.03
Two Thousand And Eighteen Reprice [Member] \| Employees [Member]
Stock-based compensation									11,900	18,200	44,600
Share-based payment arrangement, plan modification, incremental cost									$ 7,800		$ 43,700
Two Thousand And Eighteen Reprice [Member] \| Employees [Member] \| Exercise Price of Repriced Options [Member]
Share based compensation arrangement by share based payment award plan modification \| shares											158,646,785
Share-based Compensation Arrangement by Share-based Payment Award, Plan Modification, Description and Term \| $ / shares											$ 6.03
Two Thousand And Nineteen Reprice [Member]
Unrecognized share based compensation expense										900
Stock-based compensation										$ 9,200
Two Thousand And Nineteen Reprice [Member] \| Employee Director [Member]
Share based compensation arrangement by share based payment award plan modification \| shares										13,401,568
Share-based payment arrangement, plan modification, incremental cost										$ 2,000
Remaining contractual term of repriced options										10 years
Two Thousand And Nineteen Reprice [Member] \| Employee Director [Member] \| Exercise Price of Repriced Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Plan Modification, Description and Term \| $ / shares										$ 6.03
Minimum [Member] \| 2020 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent	110.00%								110.00%
Common Class A [Member] \| 2020 Equity Incentive Plan [Member]
Share-based payment award, number of additional shares authorized \| shares		250,000,000
Share based payment award expiration period and option contractual term									10 years
Restricted Stock Units (RSUs) [Member]
Cumulative stock-based compensation expense									$ 769,500
Share based payment award vesting period										5 years
Unrecognized share based compensation expense	$ 873,500								$ 873,500
Unrecognized share based compensation expense, period for recognition									3 years 2 months 12 days
Stock-based compensation									$ 940,000
Equity Instruments Other than Options, Grants in Period \| shares									98,667,215
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value									$ 531,900
Restricted Stock Units (RSUs) [Member] \| 2020 Executive Equity Incentive Plan [Member]
Equity Instruments Other than Options, Grants in Period \| shares			3,900,000
Growth units [Member]
Unrecognized share based compensation expense	$ 1,200								1,200
Stock-based compensation								$ 8,400	$ 9,600