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, 2009	$ 123,931	$ 688,844	$ (2,083)	$ 735	$ (563,565)
Balance (in shares) at Sep. 30, 2009		20,206,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(23,694)				(23,694)
Translation adjustment	42			42
Stock-based compensation (in shares)		276,000
Stock-based compensation	9,860	9,860
Stock option exercises (in shares)		0
Stock option exercises	1	1
Issuance of common stock - ESPP (in shares)		301,000
Issuance of common stock - ESPP	990	990
Costs incurred related to issuance of equity line financing facility (in shares)		514,000
Costs incurred related to issuance of equity line financing facility	2,302	2,302
Issuance of common stock - ODPP (in shares)		0
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 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
Costs incurred related to issuance of equity line financing facility (in shares)		28,000
Costs incurred related to issuance of equity line financing facility	196	196
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	9,653
Balance at Sep. 30, 2011	98,436	713,063	(2,083)	912	(613,456)
Balance (in shares) at Sep. 30, 2011	23,481,000	23,481,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net 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)	17,251	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