Statements of Operations (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended			94 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009	Sep. 30, 2011
Income Statement [Abstract]
Revenue
Operating expenses:
Research and development	13,901	26,177	32,325	130,129
General and administrative	9,321	10,980	10,994	56,946
Total operating expenses	23,222	37,157	43,319	187,075
Other (income) and expense:
Interest and other income	(60)	(17)	(386)	(5,566)
Interest expense				78
Adjustment to fair value of common stock warrant liability	(12,611)	1,254		(11,357)
Loss on settlement of debt				627
Loss before tax provision (benefit)	(10,551)	(38,394)	(42,933)	(170,857)
Tax provision (benefit)	41	(104)	337	(571)
Net loss	(10,592)	(38,290)	(43,270)	(170,286)
Charge for accretion of beneficial conversion rights				(603)
Deemed dividend - warrants				(4,457)
Net loss applicable to common stockholders	$ (10,592)	$ (38,290)	$ (43,270)	$ (175,346)
Net loss per share - basic and diluted (in dollars per share)	$ (0.34)	$ (1.58)	$ (1.82)
Weighted average shares outstanding - basic and diluted (in shares)	31,154,962	24,161,866	23,746,598