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Fair Value Measurements - Earn-out Liability - Roll Forward (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2020
USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Beginning balance $ 2,911
Change in fair value (911)
Ending balance $ 2,000