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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