Equity (Other Disclosures) (Details) (USD $)	0 Months Ended			1 Months Ended	3 Months Ended	12 Months Ended				0 Months Ended	12 Months Ended				12 Months Ended					1 Months Ended
	Sep. 18, 2013	Oct. 03, 2012	Feb. 20, 2008	Aug. 31, 2012	Mar. 31, 2011	Sep. 30, 2013 plans	Sep. 30, 2012	Sep. 30, 2011	Aug. 23, 2012	May 31, 2011 Common Stock	Sep. 30, 2013 Common Stock	Sep. 30, 2012 Common Stock	Sep. 30, 2011 Common Stock	Sep. 30, 2010 Common Stock	Sep. 30, 2011 Accumulated Deficit	Sep. 30, 2013 401(k) match in common stock	Sep. 30, 2012 401(k) match in common stock	Sep. 30, 2011 401(k) match in common stock	Sep. 30, 2012 Restricted Stock Units	Oct. 31, 2009 Equity Facility, 2009	Sep. 30, 2013 2000 Stock Option Plan	Sep. 30, 2013 2010 Equity Incentive Plan	Sep. 30, 2013 2012 Equity Incentive Plan
Class of Stock [Line Items]
Shelf registration, registered amount				$ 50,000,000
Shelf registration, effective period									3 years
Common stock issued to underwriters (in shares)	2,875,000	1,832,410									4,707,000
Proceeds from issuance of common stock	11,700,000	9,500,000
Number of equity incentive compensation plans maintained by the company						3
Number of shares available for grant																					0
Number of shares authorized																						1,750,000	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 outstanding						29,982,000	24,372,000				29,982,000	24,372,000	23,481,000	21,297,000
Preferred stock, shares issued						0	0
Preferred stock, shares outstanding						0	0
Issuance of warrants, equity line financing facility (in shares)						400,001	750,011
Issued warrants and rights, represented shares of common stock			350,010																	400,001
Stock warrants, value, reclassification to liabilities								196,000					8,218,000		8,022,000
Accelerated compensation cost					196,000		25,000												300,000
Issuance of common stock from private placement transaction (in shares)										1,101,901			1,102,000
Issuance of common stock from private placement transaction								9,653,000		9,700,000
Stock-based compensation expense						$ 4,209,000	$ 7,756,000	$ 7,428,000								$ 1,041,000	$ 1,034,000	$ 935,000
Employee stock purchase plan (ESPP), biannual plan duration						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), total shares						2,250,000
Issuance of common stock - ESPP (in shares)											344,000	250,000	359,000
Employee stock purchase plan (ESPP), aggregate common shares issued						1,813,816
Officer and director share purchase plan, shares authorized						125,000
Issuance of common stock - ODPP (in shares)											4,500	21,000	9,000