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
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Transfers between Levels      
Level 1 to Level 2 transfers, Assets $ 0   $ 0
Level 2 to Level 1 transfers, Assets 0   0
Level 1 to Level 2 transfers, Liabilities 0   0
Level 2 to Level 1 transfers, Liabilities 0   $ 0
Recurring      
Assets:      
Equity securities 1,021 $ 1,693  
Liabilities:      
Contingent consideration 75 75  
Recurring | Significant Unobservable Inputs (Level 3)      
Assets:      
Equity securities 1,021 1,693  
Liabilities:      
Contingent consideration $ 75 $ 75