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Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 2018
Fair Value Disclosures [Abstract]  
Schedule of financial assets measured at fair value on a recurring basis
     December 31, 2017     
     Fair value measurements using input type     
     Level 1   Level 2   Level 3   Total 
  Assets:                
  Corporate bonds  $-   $12,929   $-   $12,929 
  Convertible bonds   -    1,209    -    1,209 
                       
  Total financial assets  $-   $14,138   $-   $14,138 
                       
  Liabilities:                    
  Contingent consideration  $-   $-   $1,333   $1,333 
                       
  Total financials liabilities  $-   $-   $1,333   $1,333 

  

     June 30, 2018     
    

Fair value measurements using input type
Unaudited

     
     Level 1   Level 2   Level 3   Total 
  Assets:                
  Corporate bonds  $-   $10,753   $-   $10,753 
  Convertible bonds   -    1,166    -    1,166 
                       
  Total financial assets  $-   $11,919   $-   $11,919 
                       
  Liabilities:                    
  Contingent consideration  $-   $-   $504   $504 
                       
  Total financials liabilities  $-   $-   $504   $504 
Schedule of fair value measurements using significant unobservable inputs
     June 30,   December 31, 
     2018   2017 
     Unaudited     
           
  Opening balance  $1,333   $3,088 
  Payment of contingent consideration   (946)   (2,109)
  Increase in fair value of contingent consideration   139    1,587 
  Decrease in fair value of contingent consideration   -    (1,287)
  Decrease in liability against other receivables   -    (118)
  Amortization of interest and exchange rate   (22)   172 
             
  Closing balance  $504   $1,333