Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Financial Assets and Liabilities Carried at Fair Value on Recurring Basis (Details)

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Fair Value Measurements - Financial Assets and Liabilities Carried at Fair Value on Recurring Basis (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Transfers between Levels    
Level 1 to Level 2 transfers, Assets $ 0  
Level 2 to Level 1 transfers, Assets 0  
Level 1 to Level 2 transfers, Liabilities 0  
Level 2 to Level 1 transfers, Liabilities 0  
Recurring    
Assets:    
Equity securities 531 $ 681
Liabilities:    
Contingent consideration 75 75
Recurring | Significant Unobservable Inputs (Level 3)    
Assets:    
Equity securities 531 681
Liabilities:    
Contingent consideration $ 75 $ 75