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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables)
 12 Months Ended
Dec. 31, 2021
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) [Abstract]  
Components of Accumulated Other Comprehensive Income (Loss)
The changes in accumulated other comprehensive income (loss) by component, net of tax of nil, are as follows:

 
Unrealized
fair value
gain (loss)
on available-
for-sale
investments
    
Foreign
currency
translation
    
Total
  
    $
     $
     $
  
                         
Balance as of January 1, 2019
    
18,269
      
(3,070
)
    
15,199
  
Current year other comprehensive (loss) income
    
(12,869
)
    
3,119
      
(9,750
)
Balance as of December 31, 2019
     5,400      
49
      
5,449
  
Current year other comprehensive (loss) income
    
(4,419
)
    
3,603
      
(816
)
Transactions with non-controlling interest     –       48       48  
Balance as of December 31, 2020
     981      
3,700
      
4,681
  
Current year other comprehensive loss
    
(1,278
)
    
(32,263
)
     (33,541 )
Transactions with non-controlling interest     –       341       341  
Balance as of December 31, 2021
    
(297
)
    
(28,222
)
    
(28,519
)