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Number of common stock reserved for issuance term.

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Stock granted fair value share based compensation.

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

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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 cost to be recognized for option under 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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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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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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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

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

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No definition available.

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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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Intrinsic value of vested 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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Value of stock issued in lieu of cash for services contributed to the entity. Value of the stock issued includes, but is not limited to, services contributed by vendors and founders.

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Stock-Based Compensation - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jan. 01, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Allocated share-based compensation expenses	$ 20,491,000	$ 26,499,000	$ 18,926,000
Original Stock Option Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Allocated share-based compensation expenses	$ 702,000	$ 469,000	359,000
Stock options granted	0
Weighted average fair values of stock options granted, per share	$ 0	$ 0
Intrinsic values of stock options exercised	$ 5,910,000	$ 1,686,000
Unrecognized compensation expenses	$ 248,000	$ 921,000
Unrecognized stock-based compensation expense to be recognized in period, years	8 months 12 days	9 months 18 days
Fair values of stock option vested	$ 85,000	$ 2,789,000
2018 Equity Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Allocated share-based compensation expenses	$ 29,014,000	$ 31,373,000	$ 20,629,000
2018 Equity Incentive Plan [Member] \| Class 2 common stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares reserved for future issuance				17,037,421
Common shares reserved for issuance, annual automatic increase percentage	4.00%
2018 Equity Incentive Plan [Member] \| Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation, grant term	10 years
2018 Equity Incentive Plan [Member] \| Maximum [Member] \| Class 2 common stock [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] \| Non-Employee Director [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock Granted Fair Value Share Based Compensation	$ 1,000,000
2018 Equity Incentive Plan [Member] \| Non-Employee Director [Member] \| Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock Granted Value Share Based Compensation	$ 500,000,000
2018 Equity Incentive Plan [Member] \| Restricted Stock Units (RSUs) [Member] \| Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period	4 years
2018 Equity Incentive Plan [Member] \| Restricted Stock Units (RSUs) [Member] \| Minimum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period	3 years
2018 Equity Incentive Plan [Member] \| Time-based Stock Options [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options granted
Weighted average fair values of stock options granted, per share	$ 0	$ 40.11	$ 7.74
Intrinsic values of stock options exercised	$ 2,706,000	$ 29,655,000	$ 0
Unrecognized compensation expenses	$ 9,696,000	$ 23,649,000	$ 38,250,000
Unrecognized stock-based compensation expense to be recognized in period, years	1 year 6 months	1 year 10 months 24 days	2 years 9 months 18 days
Fair values of stock option vested	$ 34,001,000	$ 16,708,000	$ 5,508,000
2018 Equity Incentive Plan [Member] \| SARs [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation, number of other than optins issued	0
2018 Equity Incentive Plan [Member] \| SARs [Member] \| Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation, grant term	10 years
2018 Equity Incentive Plan [Member] \| Performance-based Stock Options [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted average fair values of stock options granted, per share	$ 0	$ 0	$ 4.15
Intrinsic values of stock options exercised	$ 1,160,000	$ 5,054,000	$ 0
Unrecognized compensation expenses	$ 0	$ 0	$ 593,000
Unrecognized stock-based compensation expense to be recognized in period, years	0 years	0 years	7 months 6 days
Fair values of stock option vested	$ 0	$ 1,246,000	$ 1,246,000
2018 Equity Incentive Plan [Member] \| Time-based RSU [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized stock-based compensation expense to be recognized in period, years	1 year 7 months 6 days	2 years 3 months 18 days	3 years 2 months 12 days
Share-based compensation, number of other than optins issued	1,884,390	1,423,392
Unrecognized stock-based compensation expense	$ 22,046,000	$ 41,898,000	$ 10,336,000
Intrinsic values of RSUs vested	187,000	3,446,000	0
Fair value of RSUs vested	$ 21,815,000	$ 4,667,000	$ 0
2018 Equity Incentive Plan [Member] \| Performance-based RSUs [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized stock-based compensation expense to be recognized in period, years	10 months 24 days	1 year	1 year 8 months 12 days
Share-based compensation, number of other than optins issued	540,836	265,625
Unrecognized stock-based compensation expense	$ 1,950,000	$ 330,000	$ 1,882,000
Intrinsic values of RSUs vested	109,000	46,423,000	0
Fair value of RSUs vested	$ 1,698,000	$ 6,087,000	$ 0