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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-Publisher FASB
-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		9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized compensation expenses	$ 375		$ 375
Unrecognized stock-based compensation expense to be recognized in period, years			9 months 18 days
Original Stock Option Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Allocated share-based compensation expense	114	$ 143	$ 410	$ 411
Stock options granted			0	0
Fair values of stock option vested			$ 118		$ 2,789
2018 Equity Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Allocated share-based compensation expense	7,966	$ 8,501	22,994	$ 21,892
Unrecognized compensation expenses	$ 40,805		$ 40,805
Unrecognized stock-based compensation expense to be recognized in period, years			1 year 10 days
2018 Equity Incentive Plan [Member] \| Time-based Stock Options [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options granted			0	10,000
Fair values of stock option vested			$ 31,299		16,708
Weighted average fair values of stock options granted, per share			$ 0	$ 12.01
2018 Equity Incentive Plan [Member] \| Performance-based Stock Options [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options granted			0	0
Fair values of stock option vested			$ 0		$ 1,246
2018 Equity Incentive Plan [Member] \| Time-based RSU [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of RSUs granted			2,024,334	944,616
Number of RSUs vested			396,051	54,635
2018 Equity Incentive Plan [Member] \| Performance-based RSUs [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of RSUs granted			448,230	0
Number of RSUs vested			159,375	731,250
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%		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	17,037,421		17,037,421		12,926,172