CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	9 Months Ended		138 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013
Operating activities:
Net loss	$ (11,095,786)	$ (29,507,800)	$ (226,157,196)
Adjustments to reconcile net loss to net cash used in operating activities:
Non-cash stock-based compensation	1,448,294	1,385,400	12,267,154
Depreciation and amortization	87,868	97,441	637,198
Stock issued for license agreement	0	0	575,023
Non-cash interest expense	0	0	34,020
Gain on disposition of assets	0	37,388	22,951
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	(848,239)	379,203	(1,199,613)
Accounts payable, accrued contract research and manufacturing expenses and other accrued expenses	403,412	(6,942,266)	2,373,691
Accrued compensation and related expenses	(14,845)	(1,209,676)	185,090
Accrued restructuring	(446,235)	1,026,931	394,949
Net cash used in operating activities	(10,465,531)	(34,733,379)	(210,432,983)
Investing activities:
Acquisitions of property and equipment	0	(25,260)	(739,731)
Proceeds from sale of assets	0	0	15,907
Purchases of short-term investments	0	0	(115,143,906)
Redemptions and sales of short-term investments	0	4,500,000	115,143,906
Security deposits	0	38,267	0
Net cash provided by (used in) investing activities	0	4,513,007	(723,824)
Financing activities:
Proceeds from borrowings from affiliate	0	0	1,745,000
Proceeds from exercise of stock options	141,012	0	228,935
Proceeds from exercise of common stock warrants	0	0	9,054,546
Recapitalization of the Company	0	0	(400,000)
Proceeds from sales of equity securities, net of issuance costs	2,781,604	22,151,851	221,331,620
Receipt of recovery of short-swing profits	0	0	73,797
Receipt of cash for stock subscription receivable	0	0	4,625
Net cash provided by financing activities	2,922,616	22,151,851	232,038,523
Net (decrease) increase in cash and cash equivalents	(7,542,915)	(8,068,521)	20,881,716
Cash and cash equivalents, beginning of period	28,424,631	41,106,301	0
Cash and cash equivalents, end of period	20,881,716	33,037,780	20,881,716
Supplemental disclosure of cash flow information:
Cash paid for interest	$ 0	$ 0	$ 224,328