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CONVERTIBLE NOTES (Tables)
 12 Months Ended
Dec. 31, 2020
CONVERTIBLE NOTES [Abstract]  
Convertible Debts
 
December 31,
  
   
2019
$
    
2020
$
  
Current:
            
2017 Convertible Notes
    
29,481
      
–
  
     
29,481
      
–
  
                 
Non-current:
                
2023 Convertible Notes
    
453,215
      
41,263
  
2024 Convertible Notes
    
903,117
      
916,560
  
2025 Convertible Notes
    
–
      
882,583
  
     
1,356,332
      
1,840,406
  
Issuance of Convertible Notes and Terms
The Company also issued the following convertible notes and the terms are as follow:
2023 Convertible Notes
2024 Convertible Notes
2025 Convertible Notes
Issuance date
June 18, 2018
November 18, 2019
May 22, 2020
Maturity date
July 1, 2023
December 1, 2024
December 1, 2025
Principal amount
$575,000
$1,150,000
$1,150,000
Interest rate
2.25%
1.00%
2.375%
Initial conversion rate
50.5165 American Depositary Shares (“ADSs”)
per $1 principal amount, equivalent
 to $19.80 per ADS
19.9475 ADSs per $1
principal amount, equivalent
to $50.13 per ADS
11.0549 ADSs per $1
principal amount, equivalent
 to $90.46 per ADS
Agreed conversion date
January 1, 2023
June 1, 2024
September 1, 2025
Convertible Notes With Cash Conversion Option
The 2023 Convertible Notes, 2024 Convertible Notes and 2025 Convertible Notes were accounted for under ASC 470-20 Cash Conversion Subsections as follow:

  
2023 Convertible
Notes
    
2024 Convertible
Notes
    
2025 Convertible
Notes
  
Liability component
  
$
410,926
    
$
897,918
    
$
856,635
  
Effective interest rate
    
9.38
%
    
6.03
%
    
8.21
%
Equity component
  
$
152,714
    
$
240,582
    
$
284,727
  
Debt issuance cost, allocated in proportion to the allocation of proceeds
  
$
11,360
    
$
11,500
    
$
8,638
  
Carrying Amount of the Liability Components
The liability component was initially measured at fair value and subsequently amortized to its redemption amount using the effective interest method. The residual value was allocated to the equity component, classified within “Additional Paid-up Capital” and not subsequently remeasured. The following table presents the carrying amount of the liability components of the 2023 Convertible Notes, 2024 Convertible Notes and 2025 Convertible Notes:

  
December 31, 2019
    
December 31, 2020
  
   
2023
Convertible
Notes
$
    
2024
Convertible
Notes
$
    
2025
Convertible
Notes
$
    
Total
$
    
2023
Convertible
Notes
$
    
2024
Convertible
Notes
$
    
2025
Convertible
Notes
$
    
Total
$
  
Principal
    
575,000
      
1,150,000
      
–
      
1,725,000
      
49,000
      
1,112,320
      
1,149,500
      
2,310,820
  
Less: unamortized issuance cost and debt discount
    
(121,785
)
    
(246,883
)
    
–
      
(368,668
)
    
(7,737
)
    
(195,760
)
    
(266,917
)
    
(470,414
)
Net carrying amount
    
453,215
      
903,117
      
–
      
1,356,332
      
41,263
      
916,560
      
882,583
      
1,840,406
  
Capped Calls
In connection with the offering of 2024 Convertible Notes and 2025 Convertible Notes, the Company entered into separately negotiated capped call transactions with certain counterparties (collectively, the “Capped Calls”). The details of the Capped Calls are as follows:

  
2024 Convertible
Notes
    
2025 Convertible
Notes
  
Initial strike price per share
  
$
50.13
    
$
90.46
  
Initial cap price per share
  
$
70.36
    
$
136.54