Consolidated Statements of Shareholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock	Treasury Stock	Accumulated Other Comprehensive Income	Accumulated Deficit
Balance at Sep. 30, 2010	$ 113,432	$ 701,997	$ (2,083)	$ 777	$ (587,259)
Balance (in shares) at Sep. 30, 2010		21,297,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(34,219)				(34,219)
Translation adjustment	135			135
Stock-based compensation (in shares)		628,000
Stock-based compensation	7,580	7,580
Stock option exercises (in shares)		58,000
Stock option exercises	320	320
Issuance of common stock - ESPP (in shares)		359,000
Issuance of common stock - ESPP	1,455	1,455
Issuance of common stock - ODPP (in shares)		9,000
Issuance of common stock - ODPP	80	80
Outstanding warrants valuation adjustment	(196)	(8,218)			(8,022)
Issuance of common stock from private placement transaction (in shares)		1,102,000
Issuance of common stock from private placement transaction	9,653
Issuance of common stock related to equity line financing facility (in shares)		28,000
Issuance of common stock related to equity line financing facility	196	196
Balance at Sep. 30, 2011	98,436	713,063	(2,083)	912	(613,456)
Balance (in shares) at Sep. 30, 2011		23,481,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(39,171)				(39,171)
Translation adjustment	464			464
Stock-based compensation (in shares)		603,000
Stock-based compensation	8,038	8,038
Stock option exercises (in shares)		17,000
Stock option exercises	75	75
Issuance of common stock - ESPP (in shares)		250,000
Issuance of common stock - ESPP	1,091	1,091
Issuance of common stock - ODPP (in shares)		21,000
Issuance of common stock - ODPP	90	90
Issuance of treasury stock	0	(12)	12
Balance at Sep. 30, 2012	69,023	722,345	(2,071)	1,376	(652,627)
Balance (in shares) at Sep. 30, 2012	24,372,000	24,372,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	4,988				4,988
Translation adjustment	247			247
Stock-based compensation (in shares)		475,000
Stock-based compensation	4,027	4,027
Stock option exercises (in shares)	78,690	79,000
Stock option exercises	395	395
Issuance of common stock - ESPP (in shares)		344,000
Issuance of common stock - ESPP	1,292	1,292
Issuance of common stock - ODPP (in shares)		4,500
Issuance of common stock - ODPP	18	18
Issuance of common stock from stock sales (in shares)		4,707,000
Issuance of common stock from stock sales	21,189	21,189
Balance at Sep. 30, 2013	$ 101,179	$ 749,266	$ (2,071)	$ 1,623	$ (647,639)
Balance (in shares) at Sep. 30, 2013	29,982,000	29,982,000