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Fair Value Measurements (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Assets:    
Corporate bonds $ 10,753 $ 12,929
Convertible bonds 1,166 1,209
Total financial assets 11,919 14,138
Liabilities:    
Contingent consideration 504 1,333
Total financials liabilities 504 1,333
Level 1 [Member]    
Assets:    
Corporate bonds
Convertible bonds
Total financial assets
Liabilities:    
Contingent consideration
Total financials liabilities
Level 2 [Member]    
Assets:    
Corporate bonds 10,753 12,929
Convertible bonds 1,166 1,209
Total financial assets 11,919 14,138
Liabilities:    
Contingent consideration
Total financials liabilities
Level 3 [Member]    
Assets:    
Corporate bonds
Convertible bonds
Total financial assets
Liabilities:    
Contingent consideration 504 1,333
Total financials liabilities $ 504 $ 1,333