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SHARE-BASED COMPENSATION - Plan (Details) - USD ($) $ in Thousands |  |  |  |  |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 02, 2020 | Aug. 10, 2020 | Mar. 27, 2020 | Aug. 02, 2019 | Feb. 07, 2019 | Jun. 30, 2020 | Jun. 30, 2021
SHARE-BASED COMPENSATION |  |  |  |  |  |  |
Number of shares may be issued to employees, directors, consultants and nonemployee service providers in the form of stock options, stock and stock appreciation rights |  |  |  |  |  |  | 10,000,000.0
Number of shares available for grant |  |  |  |  |  |  | 9,700,000
Stock options |  |  |  |  |  |  |
SHARE-BASED COMPENSATION |  |  |  |  |  |  |
Contractual life |  |  |  |  |  |  | 10 years
Stock options | Senior management |  |  |  |  |  |  |
SHARE-BASED COMPENSATION |  |  |  |  |  |  |
Contractual life |  | 10 years |  |  | 10 years |  |
Vesting percentage |  | 20.00% |  |  | 12.50% |  |
Restricted shares | Senior management |  |  |  |  |  |  |
SHARE-BASED COMPENSATION |  |  |  |  |  |  |
Restricted shares granted (in shares) |  |  |  | 39,526 | 120,000 |  |
Grant date fair value |  |  |  | $ 496 | $ 1,636 |  |
Vesting percentage |  |  |  | 20.00% | 14.30% |  |
Restricted shares forfeited (in shares) |  |  |  |  |  | 42,857 |
Restricted shares | Independent directors |  |  |  |  |  |  |
SHARE-BASED COMPENSATION |  |  |  |  |  |  |
Restricted shares granted (in shares) | 2,022 |  | 1,903 |  | 2,936 |  |
Grant date fair value | $ 30 |  | $ 18 |  | $ 40 |  |

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- Definition Represents the aggregate fair value of grants made during the period on other than stock option plans. + References No definition available. + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited 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)(1)(iv)(3) -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 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 Number of shares authorized for issuance under share-based payment arrangement. + 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)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + 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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- Definition Percentage of vesting of award under share-based payment arrangement. + 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 Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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