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Cash and cash equivalents (Tables)
 12 Months Ended
Dec. 31, 2018
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Cash and cash equivalents
     December 31, 2018      December 31, 2017  

Short-term bank deposits

      405,227        66,767  

Short-term investments

      2,357,823        —    
  

 

 

     

 

 

  
     2,763,050        66,767