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Intangible Assets (Tables)
12 Months Ended
Dec. 31, 2019
Intangible Assets [Abstract]  
Schedule of intangible assets development expenses capitalized

   2018   2019 
   Thousands
USD
   Thousands
USD
 
         
Balance as of January 1   6,755    5,983 
Amortization   (772)   (772)
Balance as of December 31   5,983    5,211