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Accounts Payable and Other Accrued Expenses - Narrative (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Sep. 30, 2017
Payables and Accruals [Abstract]    
Restitution payment accrual related to trailing fees $ 739  
Soft dollar accruals 704 $ 552
Investment banking deal expense accruals 187 187
Sales and use tax accrual $ 189 141
Recruiting fee payable   $ 482