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Fair Value Measurements - Unobservable Inputs (Details)
$ in Thousands
6 Months Ended
Mar. 31, 2019
USD ($)
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]  
Fair value beginning balance $ (680)
Settlements 295
Net adjustments to fair value 115
Fair value ending balance $ (270)