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LONG-TERM INVESTMENTS - Additional information (Details) $ in Thousands, $ in Thousands |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 16, 2025 HKD ($) | May 24, 2024 HKD ($) | Dec. 31, 2024 HKD ($) | Dec. 31, 2021 HKD ($) | Dec. 31, 2025 HKD ($) | Dec. 31, 2025 USD ($) | Dec. 31, 2024 HKD ($) | Dec. 31, 2023 HKD ($)
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |
Equity method investments |  |  | $ 557,615 |  | $ 609,656 |  | $ 557,615 |
Equity investments without readily determinable fair values |  |  | 15,575 |  | 5,564 |  | 15,575 |
Impairment charges on long-term investment using equity method |  |  |  |  | 0 |  | 0 | $ 0
Impairment provision of equity investments without readily determinable fair values |  |  | 0 |  |  |  | 0 |
Fair value loss |  |  |  |  | 10,050 |  |  |
Gain (loss) on investment |  |  |  |  | (51,619) | $ (6,632) | (103,934) | (13,497)
Gravitation and its subsidiary |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |
Percentage of equity interest | 68.00% |  |  |  |  |  |  |
Gravitation and its subsidiary |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |
Consideration | $ 786,400 |  |  |  |  |  |  |
Cash consideration | 500,000 |  |  |  |  |  |  |
Fair value of previously held equity interests | 286,400 |  |  |  |  |  |  |
Identifiable net assets acquired | 1,039,000 |  |  |  |  |  |  |
Cash and cash equivalents | 976,700 |  |  |  |  |  |  |
Short-term investment | 2,050,200 |  |  |  |  |  |  |
Loans and advances to customer | 1,377,300 |  |  |  |  |  |  |
Payables to clients | $ 2,997,600 |  |  |  |  |  |  |
Private equity fund 1 |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |
Equity method investments |  |  | 203,679 |  | 609,656 |  | 203,679 |
Impairment provision of equity method investments |  |  | 0 |  | 0 |  | 0 |
Gain (loss) on investment |  |  |  |  | 24,112 |  | (17,870) | $ (13,497)
Newflow Amity Fund I, LP |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |
Percentage of equity interest (as a percent) |  |  |  | 2.75% |  |  |  |
Equity investments without readily determinable fair values |  |  |  | $ 15,596 |  |  |  |
Gravitation Fintech HK Limited |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |
Ownership interest acquired |  | 44.10% |  |  |  |  |  |
Total consideration |  | $ 440,000 |  |  |  |  |  |
Impairment charges on long-term investment using equity method |  |  | $ 0 |  |  |  |  |
Gain (loss) on investment |  |  |  |  | $ 75,731 |  | $ 86,064 |

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