Statements of Stockholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified	Common Stock $01 Par Value	Preferred stock Series A Convertible Preferred stock $.01 Par Value	Preferred stock Series B Convertible Preferred stock $.01 Par Value	Additional Paid in Capital	Accumulated Other Comprehensive Income (loss)	Deficit Accumulated During The Development Stage	Total
Balance at Dec. 02, 2003
Increase (Decrease) In Stockholders Equity [Roll Forward]
Proceeds from sale of common stock	$ 46			$ 1,308			$ 1,354
Proceeds from sale of common stock (in shares)	4,581,240
Shares issued to employees and directors for services	7			(7)
Shares issued to employees and directors for services (in shares)	732,504
Net loss						(774)	(774)
Balance at Sep. 30, 2004	53			1,301		(774)	580
Balance (in shares) at Sep. 30, 2004	5,313,744
Increase (Decrease) In Stockholders Equity [Roll Forward]
Additional stockholder contributions				514			514
Share-based compensation				353			353
Private placement - Sale of preferred stock, net of issuance costs of $379 (July 2005) (Series A) and $1,795 (July 2006) (Series B) for 2005 and 2006 respectively		6		2,460			2,466
Private placement - Sale of preferred stock, net of issuance costs of $379 (July 2005) (Series A) and $1,795 (July 2006) (Series B) for 2005 and 2006 respectively (in shares)		569,000
Shares issued to employees and directors for services	1			60			61
Shares issued to employees and directors for services (in shares)	42,656
Founder's compensation contributed to capital				63			63
Net loss						(3,383)	(3,383)
Balance at Sep. 30, 2005	54	6		4,751		(4,157)	654
Balance (in shares) at Sep. 30, 2005	5,356,400	569,000
Increase (Decrease) In Stockholders Equity [Roll Forward]
Share-based compensation				1,132			1,132
Private placement - Sale of preferred stock, net of issuance costs of $379 (July 2005) (Series A) and $1,795 (July 2006) (Series B) for 2005 and 2006 respectively			54	19,351			19,405
Private placement - Sale of preferred stock, net of issuance costs of $379 (July 2005) (Series A) and $1,795 (July 2006) (Series B) for 2005 and 2006 respectively (in shares)			5,380,711
July 2006 - Series B preferred stock units issued July 2006 to settle debt			8	3,194			3,202
July 2006 - Series B preferred stock units issued July 2006 to settle debt (in shares)			817,468
Shares issued to employees and directors for services				23			23
Shares issued to employees and directors for services (in shares)	4,030
Accretion of fair value of beneficial conversion charge				603		(603)
Net loss						(8,068)	(8,068)
Balance at Sep. 30, 2006	54	6	62	29,054		(12,828)	16,348
Balance (in shares) at Sep. 30, 2006	5,360,430	569,000	6,198,179
Increase (Decrease) In Stockholders Equity [Roll Forward]
Proceeds from sale of common stock	58			78,697			78,755
Proceeds from sale of common stock (in shares)	5,750,000
Conversion of preferred stock on May 16, 2007	64	(6)	(62)	4
Conversion of preferred stock on May 16, 2007 (in shares)	6,407,008	(569,000)	(6,198,179)
Share-based compensation				4,224			4,224
Shares issued to employees, non-employees and directors for services				16			16
Shares issued to employees, non-employees and directors for services (in shares)	2,949
Stock options exercised				5			5
Stock options exercised (in shares)	3,542
Warrants exercised	26			397			423
Warrants exercised (in shares)	2,636,907
Deemed dividend - warrants				4,457		(4,457)
Net loss						(22,548)	(22,548)
Balance at Sep. 30, 2007	202			116,854		(39,833)	77,223
Balance (in shares) at Sep. 30, 2007	20,160,836
Increase (Decrease) In Stockholders Equity [Roll Forward]
Proceeds from sale of common stock	32			46,785			46,817
Proceeds from sale of common stock (in shares)	3,260,000
Share-based compensation				6,503			6,503
Stock options exercised	1			901			902
Stock options exercised (in shares)	174,410
Warrants exercised	1			111			112
Warrants exercised (in shares)	79,210
Issuance of restricted stock or RSU's granted				172			172
Issuance of restricted stock or RSU's granted (in shares)	9,714
Net unrealized gain (loss) on Marketable Securities					(62)		(62)
Proceeds from sale of stock - ESPP	1			180			181
Proceeds from sale of stock - ESPP (in shares)	14,388
Net loss						(43,361)	(43,361)
Balance at Sep. 30, 2008	237			171,506	(62)	(83,194)	88,487
Balance (in shares) at Sep. 30, 2008	23,698,558
Increase (Decrease) In Stockholders Equity [Roll Forward]
Share-based compensation				5,064			5,064
Stock options exercised				25			25
Stock options exercised (in shares)	17,661
Net unrealized gain (loss) on Marketable Securities					62		62
Proceeds from sale of stock - ESPP	1			169			170
Proceeds from sale of stock - ESPP (in shares)	87,453
Net loss						(43,270)	(43,270)
Balance at Sep. 30, 2009	238			176,764		(126,464)	50,538
Balance (in shares) at Sep. 30, 2009	23,803,672
Increase (Decrease) In Stockholders Equity [Roll Forward]
Registered direct offering or financing	24			8,688			8,712
Registered direct offering or financing (in shares)	2,398,200
Initial value of warrants issued in registered direct offering				(2,915)			(2,915)
Share-based compensation				5,621			5,621
Stock options exercised				68			68
Stock options exercised (in shares)	32,320
Net unrealized gain (loss) on Marketable Securities					1		1
Proceeds from sale of stock - ESPP	2			323			325
Proceeds from sale of stock - ESPP (in shares)	165,572
Net loss						(38,290)	(38,290)
Balance at Sep. 30, 2010	264			188,549	1	(164,754)	24,060
Balance (in shares) at Sep. 30, 2010	26,399,764
Increase (Decrease) In Stockholders Equity [Roll Forward]
Registered direct offering or financing	121	18		27,822			27,961
Registered direct offering or financing (in shares)	12,074,945	1,813,944
Initial value of warrants issued in registered direct offering				(9,438)			(9,438)
Share-based compensation				4,920			4,920
Stock options exercised (in shares)	417
Warrants exercised				50			50
Warrants exercised (in shares)	42,200
Issuance of restricted stock or RSU's granted	1			(1)
Issuance of restricted stock or RSU's granted (in shares)	62,149
Net unrealized gain (loss) on Marketable Securities					(1)
Proceeds from sale of stock - ESPP				118			118
Proceeds from sale of stock - ESPP (in shares)	68,208
Net loss						(10,592)	(10,592)
Balance at Sep. 30, 2011	$ 386	$ 18		$ 212,020		$ (175,346)	$ 37,078
Balance (in shares) at Sep. 30, 2011	38,647,683	1,813,944