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Share-based compensation - 2014 Plan (Detail) - 2014 Plan - USD ($)	1 Months Ended	12 Months Ended
	Apr. 30, 2014	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Leading Advice Holdings Limited [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Issued During Period, Shares, New Issues	14,195,412
Restricted shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of restricted share vested		228,200	1,318,450	2,086,450
Unrecognized compensation costs on restricted shares		$ 12,000	$ 766,000
Restricted shares | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant	14,195,412
Restricted shares | Officers and Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares expected to vest		14,536,000	14,536,000
Restricted shares | Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares expected to vest		26,000

X

- Definition

Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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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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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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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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