Share-Based Compensation - Summary of Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option grants		0
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock unit vesting	(1,056,602)
2009 Plan and 2019 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding at January 1, 2020	1,335,034
Exercised options	(32,200)
Cancelled or forfeited options	(1,800)
Outstanding at December 31, 2020	1,375,798	1,335,034
Exercisable options at December 31, 2020	314,396
Weighted Average Exercise Price
Outstanding at January 1, 2020	$ 7.60
Exercised options	5.63
Cancelled or forfeited options	7.40
Outstanding at December 31, 2020	7.87	$ 7.60
Exercisable options at December 31, 2020	$ 7.87
Weighted Average Remaining Contractual Life (in years)
Outstanding at December 31, 2020	5 years 1 month 6 days
Exercisable options at December 31, 2020	5 years
Aggregate Intrinsic Value
Outstanding at December 31, 2020	$ 13,592,884
Exercisable options at December 31, 2020	$ 3,106,232
2009 Plan and 2019 Plan [Member] \| Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock unit grants	452,274
Restricted stock unit vesting	(330,432)
Cancelled or forfeited restricted stock units	(47,078)

Share-based compensation arrangement by share-based payment award, options, aggregate intrinsic value.

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- Definition

Share based compensation arrangement by share based payment award options outstanding weighted average remaining contractual term.

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- Definition

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

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

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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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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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- Definition

The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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- Definition

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

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of share options (or share units) exercised during the current period.

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