CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Cash flows used in operating activities:
Net loss	$ (11,202)	$ (9,879)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	1,008	1,327
Stock-based compensation	2,880	2,149
Change in fair value of compound embedded derivative liability	0	(803)
Gain on disposal of assets	(159)	(153)
Loss on extinguishment of debt, net	1,594	0
Amortization of debt issuance costs	98	135
Amortization of debt discounts	936	1,247
Accretion of debt premiums	(15)	(83)
Change in operating assets and liabilities:
Accounts receivable	(114)	974
Inventory	(655)	(506)
Prepaids and other assets	(569)	(610)
Accounts payable	312	814
Accrued expenses and other liabilities	9	153
Deferred revenue	1,314	1,134
Net cash used in operating activities	(4,563)	(4,101)
Cash flows used in investing activities:
Capital expenditures	(1,054)	(470)
Proceeds from sale of fixed assets	183	156
Payments under licensing agreements	(87)	(98)
Net cash used in investing activities	(958)	(412)
Cash flows (used in) provided by financing activities:
Proceeds from the exercise of stock options and issuance of shares under ESPP	956	863
Net proceeds from the sale of common stock	0	17,055
Repurchase of 2014 Debentures	(14,606)	0
Consent fee on amendment of credit agreement	(308)	0
Repurchase and retirement of restricted stock units for payroll taxes	(1,242)	(378)
Other	59	(4)
Net cash (used in) provided by financing activities	(15,141)	17,536
Net (decrease) increase in cash	(20,662)	13,023
Cash at beginning of period	68,863	23,891
Cash at end of period	48,201	36,914
Cash paid during the period for:
Interest	2,769	2,664
Income taxes	39	76
Non-cash financing activities:
Licensing agreement costs incurred but not paid	424	0
Reclassification of compound embedded derivative liability to additional paid-in-capital	$ 0	$ 2,096