CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	6 Months Ended		135 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013
Operating activities:
Net loss	$ (7,253,103)	$ (23,431,502)	$ (222,314,513)
Adjustments to reconcile net loss to net cash used in operating activities:
Non-cash stock-based compensation	1,034,624	1,281,688	11,853,484
Depreciation and amortization	59,375	68,115	608,705
Stock issued for license agreement	0	0	575,023
Non-cash interest expense	0	0	34,020
Gain on disposition of assets	0	0	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	(118,218)	(353,989)	(469,592)
Accounts payable, accrued contract research and manufacturing expenses and other accrued expenses	102,115	(3,474,498)	2,072,394
Accrued compensation and related expenses	8,385	(1,039,518)	208,320
Accrued restructuring	(321,705)	0	519,479
Net cash used in operating activities	(6,488,527)	(26,949,704)	(206,455,979)
Investing activities:
Acquisitions of property and equipment	0	(23,121)	(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	4,515,146	(723,824)
Financing activities:
Proceeds from borrowings from affiliate	0	0	1,745,000
Proceeds from exercise of stock options	76,362	0	164,285
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	0	22,151,851	218,550,016
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	76,362	22,151,851	229,192,269
Net (decrease) increase in cash and cash equivalents	(6,412,165)	(282,707)	22,012,466
Cash and cash equivalents, beginning of period	28,424,631	41,106,301	0
Cash and cash equivalents, end of period	22,012,466	40,823,594	22,012,466
Supplemental disclosure of cash flow information:
Cash paid for interest	$ 0	$ 0	$ 224,328