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Income Taxes - Schedule of Income Before Income Taxes (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Income Tax Disclosure [Abstract]      
U.S. $ (2,103) $ (19,932) $ 5,087
Other than U.S. (5,596) 3,013 12,706
Income (loss) before income taxes $ (7,699) $ (16,919) $ 17,793