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Fair Value Measurements (Narrative) (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Contingent purchase price considerations $ 3,739 $ 10,208
Long-term Debt, Gross 13,500 20,000
Level 2 [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Contingent purchase price considerations 0 0
Debt Instrument, Fair Value Disclosure 13,400 $ 19,900
Share Exchange Agreement | Contingent Milestone Two    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Contingent Consideration 10,000  
Share Exchange Agreement | Contingent Milestone Three    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Contingent Consideration $ 10,000