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SHARE-BASED COMPENSATION - Share-based compensation expenses (Details) - HKD ($) $ in Thousands | 6 Months Ended | 9 Months Ended
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Jun. 30, 2022 | Jun. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
SHARE-BASED COMPENSATION |  |  |  |
Total share-based compensation expenses | $ 97,251 | $ 33,416 | $ 148,705 | $ 64,295
Research and development expenses |  |  |  |
SHARE-BASED COMPENSATION |  |  |  |
Total share-based compensation expenses | 69,170 | 25,202 | 106,395 | 49,290
General and administrative expenses |  |  |  |
SHARE-BASED COMPENSATION |  |  |  |
Total share-based compensation expenses | 20,294 | 4,924 | 30,694 | 8,913
Selling and marketing expenses |  |  |  |
SHARE-BASED COMPENSATION |  |  |  |
Total share-based compensation expenses | $ 7,787 | $ 3,290 | $ 11,616 | $ 6,092

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + 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 (h)(1)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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