CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	9 Months Ended		126 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012
Operating activities:
Net loss	$ (29,507,800)	$ (37,993,831)	$ (212,833,301)
Adjustments to reconcile net loss to net cash used in operating activities:
Non-cash stock-based compensation	1,385,400	2,015,150	10,376,056
Depreciation and amortization	97,441	87,780	519,421
Stock issued for license agreement	0	0	575,023
Non-cash interest expense	0	0	34,020
Loss on disposition of assets	37,388	0	35,181
Fair value of warrants for finder's agreement	0	0	433,750
Changes in operating assets and liabilities:
Prepaid contract research and manufacturing expenses, other prepaid expenses and other assets	379,203	(551,213)	(587,911)
Accounts payable, accrued contract research and manufacturing expenses and other accrued expenses	(6,942,266)	442,197	4,876,191
Accrued compensation and related expenses	(1,209,676)	15,697	209,761
Accrued restructuring	1,026,931	0	1,026,931
Net cash used in operating activities	(34,733,379)	(35,984,220)	(195,334,878)
Investing activities:
Acquisitions of property and equipment	(25,260)	(174,286)	(739,732)
Proceeds from sale of assets	0	0	3,677
Purchases of short-term investments	0	(65,608,361)	(115,143,906)
Redemptions and sales of short-term investments	4,500,000	45,105,570	115,143,906
Security deposits	38,267	0	0
Net cash provided by (used in) investing activities	4,513,007	(20,677,077)	(736,055)
Financing activities:
Proceeds from borrowings from affiliate	0	0	1,745,000
Proceeds from exercise of stock options	0	0	80,729
Proceeds from exercise of common stock warrants	0	8,372,465	9,054,546
Recapitalization of the Company	0	0	(400,000)
Proceeds from sales of equity securities, net of issuance costs	22,151,851	37,726,538	218,550,016
Receipt of recovery of short-swing profits	0	73,103	73,797
Receipt of cash for stock subscription receivable	0	0	4,625
Net cash provided by financing activities	22,151,851	46,172,106	229,108,713
Net (decrease) increase in cash and cash equivalents	(8,068,521)	(10,489,191)	33,037,780
Cash and cash equivalents, beginning of period	41,106,301	47,593,055	0
Cash and cash equivalents, end of period	33,037,780	37,103,864	33,037,780
Supplemental disclosure of cash flow information:
Cash paid for interest	$ 0	$ 0	$ 224,328