The aggregate grant-date fair value of stock options.

No definition available.

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- Definition

The automatic increase in the number of shares that may be issued under a share-based payment arrangement on the first day of each fiscal year.

+ References

No definition available.

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The automatic increase in the number of shares that may be issued under a share-based payment arrangement on the first day of each fiscal year, as a percentage of shares outstanding.

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No definition available.

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- Definition

The number of shares authorized under the plan that were originally issued under a prior stock incentive plan.

+ References

No definition available.

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- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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- Definition

Amount of cost to be recognized for option under share-based payment arrangement.

+ References

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- Definition

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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- Definition

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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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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- Definition

Number of additional shares authorized for issuance under share-based payment arrangement.

+ References

No definition available.

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Number of shares authorized for issuance under share-based payment arrangement.

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- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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- Definition

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

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- Definition

Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Stock-Based Compensation - Additional Information (Detail) - USD ($) $ in Thousands			12 Months Ended
	Jan. 01, 2021	Jun. 27, 2018	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, shares			1,331,417
Unvested Stock options			3,142,220	3,367,846
Stock Options Outstanding			2,188,919	2,827,868
Aggregate intrinsic value of options exercised			$ 26,600	$ 8,800
Share-based Payment Arrangement, Expense			24,179	$ 12,721
Probable Performance Based [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Expense			2,000
Performance Based [Member] \| Non Probable Performance Based And Service Based [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense related to unvested options			5,800
Performance Based [Member] \| Probable Performance Based And Service Based [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense related to unvested options			$ 50,100
Compensation expense, expected recognition period			3 years 7 months 6 days
Service Based Market Based And Performance Based [Member] \| Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, shares			531,108
Service Based Market Based And Performance Based [Member] \| Probable Performance Based [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate grant date fair value of options			$ 8,100
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options expiration period			10 years
Restricted Stock Units (RSUs) [Member] \| Performance Based And Service Based [Member] \| Non Probable Performance Based And Service Based [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested Stock options			270,131
Class A Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Options Outstanding			1,032,613
Class A Common Stock or Class B Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Options Outstanding			1,156,306
2018 Equity Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation, common stock available for grant			1,026,673
Share-based Compensation, number of additional shares available for issuance	1,410,678
2018 Equity Incentive Plan [Member] \| Class A Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation, common stock available for grant		2,149,480
2018 Equity Incentive Plan [Member] \| Class A Common Stock [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation, common stock available for grant		5,028,832
Annual increase in shares authorized		2,500,000
2018 Equity Incentive Plan [Member] \| Class A Common Stock and Class B Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation, number of additional shares available from 2008 Stock Incentive Plan		583,056
2018 Equity Incentive Plan [Member] \| Class A Common Stock and Class B Common Stock [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Annual percentage increase in shares authorized		5.00%