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FAIR VALUE MEASUREMENTS (Tables)
 9 Months Ended
Sep. 30, 2020
FAIR VALUE MEASUREMENTS [Abstract]  
Fair Values of Assets and Liabilities
Assets and liabilities measured at fair value on a recurring basis are summarized below:

  
Fair value measurement at December 31, 2019
  
   
Quoted prices in
active markets for
identical assets
(Level 1)
$
    
Significant other
observable
inputs
(Level 2)
$
    
Unobservable
inputs
(Level 3)
$
    
Total
$
  
                         
Cash equivalents
    
55,723
      
–
      
–
      
55,723
  
Money market funds
    
537,615
      
–
      
–
      
537,615
  
Short-term investments
    
30,324
      
–
      
72,000
      
102,324
  
Time deposits – non-current
    
216
      
–
      
–
      
216
  
Available-for-sale investments – non-current
    
–
      
–
      
56,418
      
56,418
  
2017 Convertible Notes
    
–
      
–
      
(29,481
)
    
(29,481
)
Share appreciation rights
    
(1,500
)
    
–
      
–
      
(1,500
)
                                 
     
622,378
      
–
      
98,937
      
721,315
  

 
Fair value measurement at September 30, 2020
  
   
Quoted prices in
active markets for
identical assets
(Level 1)
$
    
Significant other
observable
inputs
(Level 2)
$
    
Unobservable
inputs
(Level 3)
$
    
Total
$
  
                         
Cash equivalents
    
485,396
      
–
      
–
      
485,396
  
Short-term investments
    
21,891
      
–
      
20,429
      
42,320
  
Available-for-sale investments – non-current
    
4,993
      
–
      
37,589
      
42,582
  
Other current assets
    
–
      
–
      
17,288
      
17,288
  
Share appreciation rights
    
(7,935
)
    
–
      
–
      
(7,935
)
                                 
     
504,345
      
–
      
75,306
      
579,651
  
Level 3 Instruments Measured at Fair Value on a Recurring Basis

 
Level 3
instruments
measured at fair
value on a
recurring basis
$
  
Assets:
      
Available-for-sale investments
      
       
Current:
      
Balance at January 1, 2019
    
–
  
Investment during the year
    
72,000
  
         
Balance at December 31, 2019
    
72,000
  
Conversion into ordinary shares of investee
    
(72,000
)
Addition
    
20,429
  
         
Balance at September 30, 2020
    
20,429
  
         
Non-current:
        
Balance at January 1, 2019
    
70,374
  
Impairment loss
    
(1,087
)
Fair value loss included in other comprehensive loss
    
(16,580
)
         
Balance at September 30, 2019
    
52,707
  
Fair value gain included in other comprehensive loss
    
3,711
  
         
Balance at December 31, 2019
    
56,418
  
Allowance for credit loss
    
(13,429
)
Fair value loss included in other comprehensive loss
    
(5,400
)
         
Balance at September 30, 2020
    
37,589
  

Other current assets
      
Balance at January 1, 2019 and December 31, 2019
    
–
  
Acquisition of subsidiary
    
8,718
  
Additions
    
10,309
  
Disposals
    
(227
)
Write-down
    
(1,329
)
Exchange differences
    
(183
)
         
Balance at September 30, 2020
    
17,288
  

 
Level 3
instruments
measured at fair
value on a
recurring basis
$
  
Liabilities:
      
2017 Convertible Notes
      
Balance at January 1, 2019
    
(636,716
)
Fair value loss
    
(466,102
)
Conversion into Class A ordinary shares
    
1,080,112
  
         
Balance at September 30, 2019
    
(22,706
)
Fair value loss
    
(6,775
)
         
Balance at December 31, 2019
    
(29,481
)
         
Fair value loss
    
(87
)
Conversion into Class A ordinary shares
    
29,568
  
         
Balance at September 30, 2020
    
–