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Significant Accounting Policies (Details 3) - Fair Value, Measurements, Recurring [Member] - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Assets    
Investments $ 8,203 $ 3,043
Liabilities    
Contingent royalty obligation 1,872 1,953
Level 1 [Member]    
Assets    
Investments 8,203 3,043
Liabilities    
Contingent royalty obligation
Level 2 [Member]    
Assets    
Investments
Liabilities    
Contingent royalty obligation
Level 3 [Member]    
Assets    
Investments
Liabilities    
Contingent royalty obligation $ 1,872 $ 1,953