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LONG-TERM INVESTMENTS - Additional information (Details) $ in Thousands | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jan. 31, 2014 USD ($) | Feb. 28, 2022 USD ($) | Feb. 28, 2021 USD ($) | Feb. 29, 2020 USD ($) Transaction | Feb. 28, 2017 Transaction | Dec. 31, 2018
Schedule of Investments [Line Items] |  |  |  |  |  |
Payments to acquire Long-term Investment |  | $ 137,732 | $ 53,334 | $ 117,508 |  |
Gain (Loss) on disposal |  | 10,021 | 619 | 25,002 |  |
Fair value gain (loss) |  | 6,339 | 7,588 | 1,165 |  |
Equity method investments, impairment gain (loss) |  | $ 24,484 | 11,471 | 17,198 |  |
Term of held to maturity securities |  | 2 years |  |  |  |
BabyTree |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Payments to acquire Long-term Investment | $ 23,475 |  |  |  |  |
Loss on change in fair value |  | $ 8,887 | 3,229 | 105,447 |  |
Other investments |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Impairment loss |  | 46,581 | 3,063 | 3,444 |  |
Xiamen Meiyou Information and Technology Co., Ltd. ("Xiamen Meiyou") |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Acquired equity interest (in percentage) |  |  |  |  |  | 15.32
Long term Investment In Third party technology Company |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Impairment gain (loss) |  | $ (67,189) | $ (10,029) | $ (2,137) |  |
Ximalaya Inc |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Number of transactions | Transaction |  |  |  | 2 | 2 |
Equity interest of available for sale investment (in percentage) |  | 1.62 |  |  |  |

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