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Related-Party Transactions (Details) - Tontine [Member]
$ in Thousands
12 Months Ended
Sep. 30, 2017
USD ($)
Related Party Transaction [Line Items]  
Related Party Lease The Company is party to a sublease agreement with Tontine Associates, LLC, an affiliate of Tontine, for corporate office space in Greenwich, Connecticut. The lease was renewed for a three-year term in April 2016 with an increase in the monthly rent to $8
Monthly Lease Payments $ 8