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Share-based compensation - 2020 Plan (Detail) - USD ($) | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2020 | 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
Number of shares repurchased under repurchase programs | 9,667,230 |  |  |  |  |
Tranche One [Member] | Restricted Shares With 2 Years Vesting Period [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Restricted shares expected to vest |  | 15,059,340 |  |  |  |
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] | Restricted shares [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of shares 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] | Tranche Two [Member] | Restricted shares [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Restricted shares expected to vest |  | 330,000 |  |  |  |
2010 share incentive plan [Member] | Tranche Three [Member] | Restricted shares [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Restricted shares expected to vest |  | 320,000 |  |  |  |
2010 share incentive plan [Member] | Certain Officers and Employees [Member] | Restricted shares [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Future forfeitures rate |  | 15.00% |  |  |  |
Existing Plans |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Common shares reserved for future issuance | 21,039,742 |  |  |  |  |
2020 Incentive Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of shares available for grant | 31,000,000 | 2,685,660 |  |  |  |
Common shares reserved for future issuance | 293,028 |  |  |  |  |
Future forfeitures rate |  | 25.00% |  |  |  |
Unrecognized compensation costs on restricted shares |  |  | $ 0 |  |  |
2020 Incentive Plan | Restricted shares [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of shares granted |  | 31,091,840 |  |  |  |
Number of restricted share vested |  | 2,429,965 |  |  |  |
2020 Incentive Plan | Tranche Two [Member] | Restricted Shares With 2 Years Vesting Period [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period |  | 2 years |  |  |  |
2020 Incentive Plan | Tranche Two [Member] | Restricted Shares With 3 Years Vesting Period [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of restricted share vested |  | 30,000 |  |  |  |
Restricted shares expected to vest |  | 90,000 |  |  |  |
2020 Incentive Plan | Tranche Three [Member] | Restricted Shares With 3 Years Vesting Period [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period |  | 3 years |  |  |  |
2020 Incentive Plan | Tranche Three [Member] | Restricted Shares With 3 Years Vesting Period And Vesting On Second and Third Anniversary [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of restricted share vested |  | 2,299,965 |  |  |  |
Restricted shares expected to vest |  | 12,665,000 |  |  |  |
2020 Incentive Plan | Tranche Four [Member] | Restricted Shares With 3 Years Vesting Period And Vesting On Second and Third Anniversary [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period |  | 3 years |  |  |  |
2020 Incentive Plan | Tranche Five [Member] | Restricted Shares With 5 Years Vesting Period [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of restricted share vested |  | 100,000 |  |  |  |
Restricted shares expected to vest |  | 500,000 |  |  |  |
Vesting period |  | 5 years |  |  |  |

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- Definition Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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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 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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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. + References No definition available. + Details
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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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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