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Convertible promissory notes (Tables)
12 Months Ended
Dec. 31, 2019
Convertible promissory notes  
Schedule of components effecting the change in fair value

 

 

 

 

 

 

 

 

    

Year ended December 31, 2018

    

Year ended December 31, 2019

Balance at January 1

 

$

 —

 

$

51,922

Issuance

 

 

29,131

 

 

 —

Change in fair value

 

 

22,791

 

 

(14,591)

Conversion to ordinary shares

 

 

 —

 

 

(21,562)

Forward contracts

 

 

 —

 

 

(15,769)

Balance at December 31

 

$

51,922

 

$

 —