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SHARE-BASED COMPENSATION - Stock options (Details) - $ / shares |  |  |  | 6 Months Ended
--- | --- | --- | --- | ---
Jun. 07, 2022 | Sep. 23, 2021 | Aug. 10, 2020 | Jun. 30, 2022
Stock options |  |  |  |
SHARE-BASED COMPENSATION |  |  |  |
Stock options granted (in shares) |  |  |  | 1,025,000
Exercise price (in dollar per share) |  |  |  | $ 40.59
Stock option forfeited (in shares) |  |  |  | 28,000
Fair value assumptions for options granted |  |  |  |
Expiration period |  |  |  | 10 years
Stock options | Senior management |  |  |  |
SHARE-BASED COMPENSATION |  |  |  |
Stock options granted (in shares) |  | 55,490 | 34,626 |
Exercise price (in dollar per share) |  | $ 18.02 | $ 14.44 |
Vesting percentage |  | 10.00% | 20.00% |
Fair value assumptions for options granted |  |  |  |
Risk free interest rate |  | 1.41% | 0.24% |
Dividend yield |  | 0.00% | 0.00% |
Expected volatility |  | 75.00% | 75.00% |
Expiration period |  | 10 years | 10 years |
Expected life |  | 7 years 9 months 18 days | 6 years 6 months |
Stock options | Senior management | Departure of senior manager |  |  |  |
SHARE-BASED COMPENSATION |  |  |  |
Stock option forfeited (in shares) |  |  |  | 27,701
Stock options | Chief Executive Officer |  |  |  |
SHARE-BASED COMPENSATION |  |  |  |
Stock options granted (in shares) | 900,000 |  |  |
Vesting percentage | 10.00% |  |  |
Fair value assumptions for options granted |  |  |  |
Risk free interest rate | 2.98% |  |  |
Dividend yield | 0.00% |  |  |
Expected volatility | 45.70% |  |  |
Expiration period | 10 years |  |  |
Expected life | 7 years 9 months 18 days |  |  |
Stock options | Chief Executive Officer | Tranche One |  |  |  |
SHARE-BASED COMPENSATION |  |  |  |
Stock options granted (in shares) | 300,000 |  |  |
Exercise price (in dollar per share) | $ 36.00 |  |  |
Stock options | Chief Executive Officer | Tranche Two |  |  |  |
SHARE-BASED COMPENSATION |  |  |  |
Stock options granted (in shares) | 600,000 |  |  |
Exercise price (in dollar per share) | $ 48.00 |  |  |
Incentive Stock Options [Member] | Chief Executive Officer |  |  |  |
SHARE-BASED COMPENSATION |  |  |  |
Stock options granted (in shares) | 62,460 |  |  |
Exercise price (in dollar per share) | $ 16.01 |  |  |
Vesting percentage | 10.00% |  |  |
Fair value assumptions for options granted |  |  |  |
Risk free interest rate | 2.98% |  |  |
Dividend yield | 0.00% |  |  |
Expected volatility | 45.70% |  |  |
Expiration period | 10 years |  |  |
Expected life | 7 years 9 months 18 days |  |  |

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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + 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 (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the 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 (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + 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 (f)(2)(iv) -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 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. + 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 Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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