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Investments - Summary of Contingent Consideration Measured at Fair Value (Details) - Contingent Consideration
$ in Thousands
3 Months Ended
Dec. 31, 2019
USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
September 30, 2019 $ 1,601
Foreign currency effect on contingent consideration 41
Balance at December 31, 2019 $ 1,642