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SHARE-BASED COMPENSATION - Share Options (Details) - Share Options $ / shares in Units, $ in Thousands, $ in Thousands |  |  | 1 Months Ended | 6 Months Ended | 9 Months Ended
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Dec. 31, 2019 HKD ($) shares | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 30, 2019 HKD ($) shares | Dec. 30, 2019 USD ($) $ / shares shares | Dec. 31, 2018 | Oct. 31, 2014 shares | Jun. 30, 2022 $ / shares shares | Jun. 30, 2021 $ / shares shares | Sep. 30, 2022 $ / shares shares | Sep. 30, 2021 $ / shares shares
Summary of the stock option activity, Options granted share Number: |  |  |  |  |  |  |  |  |  |
Outstanding at beginning of year (in shares) |  |  |  |  |  |  | 13,341,466 |  | 13,341,466 |
Exercised (in shares) |  |  |  |  |  |  | (1,197,536) | (2,395,392) | (1,475,848) | (4,192,000)
Outstanding at end of year (in shares) |  |  |  |  |  |  | 11,840,890 |  | 11,518,482 |
Summary of the stock option activity, Weighted average exercise price per option: |  |  |  |  |  |  |  |  |  |
Outstanding at beginning of year (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 0.5703 |  | $ 0.5703 |
Outstanding at end of year (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 0.5627 |  | $ 0.5645 |
Minimum |  |  |  |  |  |  |  |  |  |
SHARE-BASED COMPENSATION |  |  |  |  |  |  |  |  |  |
Vesting period (in years) |  |  |  |  |  | 4 years | 4 years |  | 4 years |
Maximum |  |  |  |  |  |  |  |  |  |
SHARE-BASED COMPENSATION |  |  |  |  |  |  |  |  |  |
Vesting period (in years) |  |  |  |  |  | 5 years | 5 years |  | 5 years |
2014 Share Incentive Plan |  |  |  |  |  |  |  |  |  |
SHARE-BASED COMPENSATION |  |  |  |  |  |  |  |  |  |
Maximum number of shares under the plan |  |  |  |  |  | 135,032,132 |  |  |  |
Expire period |  |  |  |  |  | 10 years |  |  |  |
Modification of exercise price of number of stock options granted | 8,113,145 | 8,113,145 | 8,113,145 | 8,113,145 |  |  |  |  |  |
Modified of exercise price of stock options granted | $ / shares |  | $ 0.60 |  | $ 0.60 |  |  |  |  |  |
Incremental compensation expenses | $ 3,008 | $ 386 | $ 3,008 | $ 386 |  |  |  |  |  |
2014 Share Incentive Plan | Minimum |  |  |  |  |  |  |  |  |  |
SHARE-BASED COMPENSATION |  |  |  |  |  |  |  |  |  |
Vesting period (in years) |  |  |  |  |  | 4 years |  |  |  |
2014 Share Incentive Plan | Maximum |  |  |  |  |  |  |  |  |  |
SHARE-BASED COMPENSATION |  |  |  |  |  |  |  |  |  |
Vesting period (in years) |  |  |  |  |  | 5 years |  |  |  |
2019 Share Incentive Plan | Maximum |  |  |  |  |  |  |  |  |  |
SHARE-BASED COMPENSATION |  |  |  |  |  |  |  |  |  |
Maximum percentage of shares available for issuance, based on total number of shares issued and outstanding on September 29, 2019 |  |  |  |  | 2.00% |  |  |  |  |
Maximum percentage of number of shares increased in each year |  |  |  |  | 2.00% |  |  |  |  |
Maximum percentage of aggregate number of shares initially reserved and subsequently increased during the term of the total number of shares issued and outstanding on September 29 |  |  |  |  | 8.00% |  |  |  |  |
2014 Share Incentive Plan and 2019 Share Incentive Plan |  |  |  |  |  |  |  |  |  |
Summary of the stock option activity, Options granted share Number: |  |  |  |  |  |  |  |  |  |
Outstanding at beginning of year (in shares) |  |  |  |  |  |  | 13,341,466 | 19,042,336 | 13,341,466 | 19,042,336
Exercised (in shares) |  |  |  |  |  |  | (1,197,536) | (2,395,392) | (1,475,848) | (4,192,000)
Granted (in shares) |  |  |  |  |  |  | 0 | 0 | 0 | 1,080,000
Cancelled/Forfeited (in shares) |  |  |  |  |  |  | (303,040) | (505,360) | (347,136) | (743,998)
Outstanding at end of year (in shares) |  |  |  |  |  |  | 11,840,890 | 16,141,584 | 11,518,482 | 15,186,338
Summary of the stock option activity, Weighted average exercise price per option: |  |  |  |  |  |  |  |  |  |
Outstanding at beginning of year (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 0.5703 | $ 0.5628 | $ 0.5703 | $ 0.5628
Exercised (in dollars per share) | $ / shares |  |  |  |  |  |  | 0.6469 | 0.4365 | 0.5996 | 0.3619
Granted (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  | 0.0444
Cancelled/forfeited (in dollars per shares) | $ / shares |  |  |  |  |  |  | 0.5634 | 0.6572 | 0.6368 | 0.6548
Outstanding at end of year (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 0.5627 | $ 0.5786 | $ 0.5645 | $ 0.5769

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