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Fair Value Measurements - Schedule of Changes in Level 3 Liabilities (Details) - Significant Unobservable Inputs (Level 3) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance $ 585 $ 2,081
Acquisition date fair value of contingent consideration liability 0 585
Change in fair value of contingent consideration recognized in selling, general and administrative expenses 0 (2,081)
Ending Balance $ 585 $ 585