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Property and Equipment, net Assets Financed by Financing Obligations (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Sep. 30, 2017
Assets financed by financing obligations [Abstract]    
Assets financed by financing obligations, gross $ 45,816 $ 45,816
Less accumulated depreciation and amortization (11,526) (8,844)
Assets financed by financing obligation, net $ 34,290 $ 36,972