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Fair Value Measurement - Fair Value of Contingent Liabilities (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Contingent consideration liability balance at the beginning of year $ 678 $ 599
Loss on change in fair value included in earnings 0 79
Contingent consideration liability balance at the end of year $ 678 $ 678