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Intangible Assets - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Finite-Lived Intangible Assets, Net [Abstract]        
Amortization of intangible assets $ 300,000 $ 300,000 $ 700,000 $ 700,000
Long-lived asset impairment     $ 0