Common stock, capital shares reserved for future issuance, annual automatic increase percentage.

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- Definition

Number of common stock reserved for issuance term.

+ 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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-Name Accounting Standards Codification
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- Definition

Aggregate number of common shares reserved for future issuance.

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-Publisher FASB
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- Definition

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

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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

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

+ References

No definition available.

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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- Definition

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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Stock-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Allocated share-based compensation expenses	$ 6,493	$ 7,138
Original Stock Option Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Allocated share-based compensation expenses	57	$ 162
Unrecognized compensation expenses	$ 193
Unrecognized stock-based compensation expense to be recognized in period, years	7 months 6 days
Stock options granted	0	0
Fair values of stock option vested	$ 61	$ 169
2018 Equity Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Allocated share-based compensation expenses	7,084	7,515
Unrecognized compensation expenses	$ 29,883
Unrecognized stock-based compensation expense to be recognized in period, years	1 year 7 months 17 days
2018 Equity Incentive Plan [Member] \| Time-based Stock Options [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Fair values of stock option vested	$ 2,547	$ 25,426
Weighted average fair values of stock options granted, per share	$ 0	$ 0
2018 Equity Incentive Plan [Member] \| Time-based RSU [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of RSUs granted	350,311	752,283
Number of RSUs vested	289,388	154,642
2018 Equity Incentive Plan [Member] \| Performance-based RSUs [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of RSUs granted	0	0
Number of RSUs vested	341,543	53,125
2018 Equity Incentive Plan [Member] \| Class 2 common stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common shares reserved for issuance, annual automatic increase percentage	4.00%
2018 Equity Incentive Plan [Member] \| Class 2 common stock [Member] \| Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of common stock reserved for issuance, term	10 years
2018 Equity Incentive Plan [Member] \| Class 2 common stock [Member] \| Stock Options and Restricted Stock Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares are reserved for issuance	23,375,665		17,037,421