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Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 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 

 

   December 31, 2018 
   Fair value measurements using input type 
   Level 1   Level 2   Level 3   Total 
Assets:                
Corporate bonds  $-   $8,757   $-   $8,757 
Convertible bonds   -    1,156    -    1,156 
                     
Total financial assets  $-   $9,913   $-   $9,913 
                     
Liabilities:                    
Contingent consideration  $-   $-   $414   $414 
                     
Total financials liabilities  $-   $-   $414   $414 
Schedule of fair value measurements using significant unobservable inputs
  December 31, 
   2017   2018 
         
Opening balance  $3,088   $1,333 
Increase in contingent consideration due to acquisitions   -    124 
Payment of contingent consideration   (2,109)   (974)
Increase in fair value of contingent consideration   1,587    210 
Decrease in fair value of contingent consideration   (1,287)   (248)
Decrease in liability against other receivables   (118)   - 
Amortization of interest and exchange rate   172    (31)
           
Closing balance  $1,333   $414