Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended			94 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009	Sep. 30, 2011
Cash flows from operating activities:
Net loss	$ (10,592)	$ (38,290)	$ (43,270)	$ (170,286)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	938	991	877	4,078
Founder's compensation contributed to capital				271
Share-based compensation for employees and directors	4,964	5,628	4,970	25,796
Share-based compensation for non-employees	(44)	(7)	94	2,274
Loss on settlement of debt				627
Write-off of capitalized patent expense				208
Write-off of loan to related party				41
Adjustment to fair value of common stock warrant liability	(12,611)	1,254		(11,357)
(Increase) decrease in:
Prepaid expenses and other assets	(41)	117	768	(406)
Income taxes receivable	81	636	1,236	(35)
Other receivable	10	(11)		(1)
Increase (decrease) in:
Accounts payable	(1,767)	982	194	222
Income tax payable	58	(120)	(847)	103
Accrued expenses and other liabilities	753	(5,561)	715	3,325
Total adjustments	(7,659)	3,909	8,007	25,146
Net cash used in operating activities	(18,251)	(34,381)	(35,263)	(145,140)
Cash flows from investing activities:
Purchase of property and equipment	(189)	(292)	(637)	(6,290)
Purchase of marketable securities		(6,000)		(31,614)
Sale of marketable securities	6,000		25,614	31,614
Capitalized intellectual properties				(298)
Loan to related party				(41)
Net cash provided by (used in) investing activities	5,811	(6,292)	24,977	(6,629)
Cash flows from financing activities:
Restricted cash	90	(150)		(60)
Options exercised		68	25	1,000
Warrants exercised	50			585
Deferred public offering costs				(1,458)
Stockholder contribution				1,660
Net proceeds from employee stock purchase plan	118	325	170	794
Net proceeds from sale of common stock	25,276	8,712		161,018
Proceeds from bridge financing				2,575
Net cash provided by financing activities	28,219	8,955	195	190,470
Net increase (decrease) in cash and cash equivalents	15,779	(31,718)	(10,091)	38,701
Cash and cash equivalents, beginning of period	22,922	54,640	64,731
Cash and cash equivalents, end of period	38,701	22,922	54,640	38,701
Cash paid for interest and income taxes was:
Interest				9
Income taxes		60	111	306
Non-cash financing and investing activities:
Warrants issued in connection with registered direct offering	9,438	2,915		12,353
Settlement of debt with Series B preferred stock				3,202
Accrued expenses settled with Series B preferred stock				150
Deemed dividend - warrants				4,457
Accretion of fair value of beneficial charge on preferred stock				603
Conversion of convertible preferred stock to common stock				68
Series A Preferred stock
Cash flows from financing activities:
Net proceeds from sale of Series A preferred stock 2005				2,466
Net proceeds from sale of Series A preferred stock 2011	2,685			2,685
Series B Preferred stock
Cash flows from financing activities:
Net proceeds from sale of Series A preferred stock 2005				$ 19,205