Aggregate number of common shares reserved for future issuance.

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-Name Accounting Standards Codification
-Topic 210
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- Definition

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

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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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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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 718
-SubTopic 10
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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).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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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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No definition available.

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- Definition

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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- Definition

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 and are expected to vest over a specific period.

+ References

No definition available.

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Share-based compensation - 2010 Plan (Detail) - USD ($)	1 Months Ended	12 Months Ended
Share-based compensation - 2010 Plan (Detail) - USD ($)	Dec. 31, 2010	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Jan. 31, 2015	Nov. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares reserved for future issuance					10,991,120	10,000,000
Minimum \| Share options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	7 years
Maximum [Member] \| Share options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	10 years
2010 share incentive plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation costs on restricted shares		$ 18,147,328
2010 share incentive plan [Member] \| Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		32 months
2010 share incentive plan [Member] \| Share options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation costs on share options		$ 0	$ 0
2010 share incentive plan [Member] \| Restricted shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted				800,000
Number of restricted share vested		400,000	965,500	1,296,540
Unrecognized compensation costs on restricted shares		$ 1,031,340	$ 2,000,000
2010 share incentive plan [Member] \| Restricted shares [Member] \| Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares expected to vest		10,770,520	10,770,520
2010 share incentive plan [Member] \| Restricted shares [Member] \| Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares expected to vest		330,000
2010 share incentive plan [Member] \| Restricted shares [Member] \| Tranche Three [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares expected to vest		320,000
2010 share incentive plan [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant	26,822,828