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Cash and cash equivalents (Tables)
 12 Months Ended
Dec. 31, 2017
Cash and cash equivalents (Tables) [Abstract]  
Cash and cash equivalents

6. Cash and cash equivalents 

 

  

December 31,

 

 

  

2017

 

  

2016

 

Short-term bank deposits

  

 

66,767

 

  

 

79,969

 

  

 

 

 

  

 

 

 

  

 

66,767

 

  

 

79,969