CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Cash flows (used in) provided by operating activities:
Net loss	$ (18,075)	$ (22,078)	$ (1,112)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:
Depreciation and amortization	2,041	2,375	2,963
Stock-based compensation	6,075	4,396	4,442
Change in fair value of compound embedded derivative liability	0	(803)	(4,897)
Deferred income taxes	(15)	156	(1,537)
Restructuring charges	0	0	(1,424)
Loss on asset impairment	0	0	1,324
Gain on disposal of assets	(131)	(153)	0
Loss on extinguishment of debt, net	1,594	0	0
Amortization of debt issuance costs	190	272	272
Amortization of debt discounts	1,806	2,552	2,363
Accretion of debt premiums	(15)	(171)	(157)
Change in operating assets and liabilities:
Accounts receivable	(1,043)	(404)	188
Inventories	(2,100)	1,368	8,797
Prepaids and other assets	601	535	739
Accounts payable	(673)	1,710	528
Accrued expenses and other current liabilities	112	(218)	(2,410)
Deferred revenue	2,687	1,344	(3,007)
Net cash (used in) provided by operating activities	(6,946)	(9,119)	7,072
Cash flows used in investing activities:
Capital expenditures	(1,484)	(1,306)	(808)
Payments under licensing agreements	(510)	(342)	(867)
Proceeds from sale of fixed assets	183	156	73
Net cash used in investing activities	(1,811)	(1,492)	(1,602)
Cash flows provided by financing activities:
Proceeds from the exercise of stock options and issuances of shares under the employee stock purchase plan	1,937	1,686	1,753
Net proceeds from the sale of common stock	26,656	54,520	0
Repurchase of convertible subordinated debentures	(14,606)	0	0
Consent fee on amendment of credit agreement	(308)	0	0
Cash restricted under credit agreement	(687)	0	0
Prepayment fee on senior debt	0	0	0
Repurchase and retirement of restricted stock units for payroll taxes	(1,254)	(618)	(639)
Other	59	(5)	(11)
Net cash provided by financing activities	11,797	55,583	1,103
Net increase in cash	3,040	44,972	6,573
Cash at beginning of year	68,863		23,891
Cash at end of year	71,903	68,863
Cash paid (refunded) during the fiscal year for:
Interest	4,861	5,323	5,341
Income taxes	(20)	(1,245)	1,440
Non cash investing and financing activities:
Common stock issued in exchange for Series B Preferred Shares	0	7	0
Licensing agreement obligation incurred but not paid	156	0	0
2014 Debentures
Non cash investing and financing activities:
Equity offering costs incurred but not paid	51	79	0
2024 Debentures | Common stock
Non cash investing and financing activities:
Reclassification of compound embedded derivative liability to additional paid-in-capital	$ 0	$ 2,096	$ 0