Commitments and Contingencies - Narrative (Details) - USD ($)	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Loss Contingencies [Line Items]
Deferred rent	$ 33,000	$ 160,000
Rent expense under operating leases	3,947,000	3,828,000
Sublease income under operating subleases	139,000	153,000
Pending And Threatened Litigation | Professional Fees
Loss Contingencies [Line Items]
Litigation and FINRA related expenses	2,057,000	1,542,000
Pending And Threatened Litigation | Accounts Payable and Accrued Expenses
Loss Contingencies [Line Items]
Accrued litigation liability	817,000	440,000
Letter of Credit
Loss Contingencies [Line Items]
Maximum borrowing capacity	$ 218,000	$ 92,000