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Shares available for purchases under employee purchase plan.

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Aggregate number of common shares reserved for future issuance.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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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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Amount of noncash expense for award of restricted stock or unit under share-based payment arrangement.

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Amount of noncash expense for share-based payment arrangement.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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

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

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Intrinsic value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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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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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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Purchase price of common stock expressed as a percentage of its fair value.

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Equity Plans and Stock-Based Compensation - Additional Information (Detail) - USD ($)			12 Months Ended
	May 31, 2018	May 28, 2014	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	May 31, 2021	Jan. 31, 2021
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Outstanding stock awards granted			10,399,000	8,505,000
Total intrinsic value of options exercised			$ 7,900,000	$ 100,000	$ 26,000
Total fair value of stock options vested			9,000,000.0	13,800,000	19,500,000
Share-based Payment Arrangement, Noncash Expense			$ 21,285,000	13,484,000	25,456,000
Expected dividend yield			0.00%
Stock-based compensation expense			$ 3,075,000
Increase in aggregate number of shares of common stock authorized for issuance						1,000,000
Restructuring
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense			0	0	4,122,000
Restricted Stock Units (RSUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock based compensation expense related to restricted stock			7,900,000
Aggregate intrinsic value			37,300,000
Total fair value of restricted stock units			$ 4,700,000	$ 4,900,000	7,900,000
Restricted stock unit awards outstanding			2,651,000	1,794,000
Share vested			537,000
Employee Stock Option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Outstanding stock awards granted			117,000
Performance Based Vesting Condition
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock based compensation expense related to restricted stock			$ 0	$ 100,000	$ 500,000
Restricted stock unit awards outstanding			202,050
Performance Based Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock based compensation expense related to restricted stock			$ 1,800,000
Aggregate intrinsic value			$ 3,300,000
Restricted stock unit awards outstanding			237,000
Share vested			0
Maximum \| Employee Stock Option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expiration period			10 years
Options vesting period			3 years
Minimum \| Employee Stock Option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expiration period			7 years
Options vesting period			4 years
2018 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expiration period	7 years
Shares reserved and approved for issuance			4,851,391
Common Stock, Capital Shares Reserved for Future Issuance			3,250,000				1,500,000
Amended 2018 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares remaining available for future purchases			22,517,869
Time Based Vesting Schedule
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total unrecognized compensation cost related to non-vested equity awards			$ 33,000,000.0
Total unrecognized compensation cost, weighted-average vesting period			2 years
Time Based Vesting Schedule \| Performance Based Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total unrecognized compensation cost related to non-vested equity awards			$ 200,000
Performance Based Vesting Schedule
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total unrecognized compensation cost related to non-vested equity awards			1,000,000.0
2014 Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total unrecognized compensation cost related to non-vested equity awards			$ 1,100,000
Total unrecognized compensation cost, weighted-average vesting period			1 year 6 months
Shares issued to employees			217,270
Shares remaining available for future purchases			1,038,313
2014 Employee Stock Purchase Plan \| The commencement of the offer period (generally, the sixteenth day in February or August)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Purchase price per share as percentage of fair market value of common stock		85.00%
2014 Employee Stock Purchase Plan \| The exercise date, which is the last day of a purchase period (generally, the fifteenth day in February or August)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Purchase price per share as percentage of fair market value of common stock		85.00%
2014 Employee Stock Purchase Plan \| Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares remaining available for future purchases						1,850,000,000