COMMITMENTS AND CONTINGENCIES - Narrative (Details)	3 Months Ended
	Dec. 31, 2016 USD ($) Letter_of_credit	Dec. 31, 2015 USD ($)	Sep. 30, 2016 USD ($)
Loss Contingencies [Line Items]
Rent expense	$ 995,000	$ 956,000
Sublease income	37,000	36,000
Pending Litigation | Professional Fees
Loss Contingencies [Line Items]
Legal fees	$ 546,000	$ 225,000
Letter of Credit
Loss Contingencies [Line Items]
Number of letters of credit, outstanding | Letter_of_credit	3
Maximum borrowing capacity	$ 354,000
Accounts Payable and Other Liabilities | Pending Litigation
Loss Contingencies [Line Items]
Estimate of possible loss	$ 421,000		$ 832,000