Equity (Other Disclosures) (Details) (USD $)	0 Months Ended		3 Months Ended	12 Months Ended					1 Months Ended	0 Months Ended	3 Months Ended	12 Months Ended				0 Months Ended	12 Months Ended
	May 31, 2011	Feb. 20, 2008	Mar. 31, 2011	Sep. 30, 2012 plans	Sep. 30, 2011	Sep. 30, 2010	Mar. 31, 2012	Jan. 27, 2012	Oct. 31, 2009 Equity Facility, 2009	May 31, 2011 Common Stock	Mar. 31, 2011 Common Stock	Sep. 30, 2012 Common Stock	Sep. 30, 2011 Common Stock	Sep. 30, 2010 Common Stock	Sep. 30, 2009 Common Stock	Oct. 02, 2009 Common Stock Equity Facility, 2009	Sep. 30, 2012 401(k) match in common stock	Sep. 30, 2011 401(k) match in common stock	Sep. 30, 2010 401(k) match in common stock
Option, Stock Class and Plan Disclosures:
Reverse stock split arrangement								4
Number of equity incentive compensation plans maintained by the company				3
Number of additional shares available for grant under 2000 Plan				0
Number of stock-based awards that may be granted, 2010 Equity Plan				1,750,000
Number of authorized shares for 2012 Equity Plan							1,000,000
Common stock, shares authorized				50,000,000	50,000,000
Common stock, par value (in dollars per share)				$ 0	$ 0
Preferred stock, shares authorized				5,882,000	5,882,000
Preferred stock, par value (in dollars per share)				$ 0.0001	$ 0.0001
Common stock, shares issued				24,412,000	23,521,000
Preferred stock, shares issued				0	0
Common stock, shares outstanding				24,372,000	23,481,000							24,372,000	23,481,000	21,297,000	20,206,000
Preferred stock, shares outstanding				0	0
Warrants representing shares outstanding				750,011	750,011				400,001
Issuance of warrants, equity line financing facility		350,010							400,001
Outstanding warrants valuation adjustment					$ 196,000						$ 8,218,000		$ 8,218,000
Accelerated compensation cost			196,000	300,000
Issuance of common stock from private placement transaction										1,101,901
Net proceeds from private placement transaction				0	9,653,000	0				9,700,000						200,000
Registration rights agreement, maximum allowable period to register shares on Form S-1 (in days)	60 days
Registration rights agreement, maximum period to have registration statement declared effective (in days)	120 days
Stock-based compensation expense				7,756,000	7,428,000	9,860,000											1,034,000	935,000	864,000
Employee stock purchase plan (ESPP), biannual plan duration (in months)				6 months
Employee stock purchase plan (ESPP), employee purchase price percentage				85.00%
Employee stock purchase plan (ESPP), annual employee contribution limit percentage				10.00%
Employee stock purchase plan (ESPP), annual employee contribution limit				$ 25,000
Employee stock purchase plan (ESPP), number of shares on which options may be granted				2,250,000
Issuance of common stock - ESPP (in shares)												250,000	359,000	301,000
Employee stock purchase plan (ESPP), common shares issued				1,469,641
Officer and director share purchase plan (ODPP), shares authorized				125,000
Officer and director share purchase plan (ODPP), issuance of common stock												21,000	9,000	0