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SHARE-BASED COMPENSATION - Fair value of options granted and compensation expenses (Details) $ in Thousands, $ in Thousands | 6 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
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Jun. 30, 2022 HKD ($) | Sep. 30, 2022 HKD ($) | Sep. 30, 2021 | Dec. 31, 2021 HKD ($) | Sep. 30, 2022 USD ($) | Jun. 30, 2022 USD ($) | Dec. 31, 2021 USD ($)
2014 Share Incentive Plan |  |  |  |  |  |  |
Fair value of options granted estimation: |  |  |  |  |  |  |
Unrecognized compensation expenses | $ 173,796 |  |  | $ 201,948 |  |  | $ 25,897
Share Options |  |  |  |  |  |  |
Fair value of options granted estimation: |  |  |  |  |  |  |
Expected term (in years) |  |  | 5 years |  |  |  |
Expected dividend yield (as a percent) |  |  | 0.00% |  |  |  |
Expected volatility (as a percent) |  |  | 40.00% |  |  |  |
Expected forfeiture rate (post-vesting) (as a percent) |  |  | 15.00% |  |  |  |
Unrecognized compensation expenses |  | $ 160,054 |  | $ 201,948 | $ 20,389 | $ 22,146 | $ 25,897
Weighted-average period expected to be recognized for unrecognized compensation expense (in years) | 3 years 6 months 10 days | 3 years 3 months 21 days |  | 3 years 11 months 15 days |  |  |
Share Options | Minimum |  |  |  |  |  |  |
Fair value of options granted estimation: |  |  |  |  |  |  |
Risk-free interest rate (as a percent) |  |  | 0.09% |  |  |  |
Share Options | Maximum |  |  |  |  |  |  |
Fair value of options granted estimation: |  |  |  |  |  |  |
Risk-free interest rate (as a percent) |  |  | 0.89% |  |  |  |

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- Definition The estimated forfeiture rate of the underlying shares over the option's term. + References No definition available. + Details
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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Amount of cost to be recognized for option under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI https://asc.fasb.org/extlink&oid=128089324&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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI https://asc.fasb.org/extlink&oid=128089324&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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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