CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	3 Months Ended		144 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014
Operating activities:
Net loss	$ (8,073,660)	$ (3,917,219)	$ (239,551,303)
Adjustments to reconcile net loss to net cash used in operating activities:
Non-cash stock-based compensation	706,060	625,874	13,371,996
Depreciation and amortization	16,083	29,909	675,373
Stock issued for license agreement	0	0	575,023
Non-cash interest expense	0	0	34,020
Loss (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	(108,886)	(188,135)	(1,243,769)
Accounts payable, accrued contract research and manufacturing expenses and other accrued expenses	722,421	103,818	3,485,538
Accrued compensation and related expenses	234,806	173,257	505,225
Accrued restructuring	(230,257)	(193,013)	(16,944)
Net cash used in operating activities	(6,733,433)	(3,365,509)	(221,708,140)
Investing activities:
Acquisitions of property and equipment	0	0	(742,724)
Investment in intangible asset	(1,500,000)	0	(1,500,000)
Proceeds from sale of assets	0	0	15,907
Puchases of short-term investments	0	0	(115,143,906)
Redemptions and sales of short-term investments	0	0	115,143,906
Net cash used in investing activities	(1,500,000)	0	(2,226,817)
Financing activities:
Proceeds from borrowings from affiliate	0	0	1,745,000
Proceeds from exercise of stock options	594	0	229,529
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	0	250,317,683
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	594	0	261,025,180
Net (decrease) increase in cash and cash equivalents	(8,232,839)	(3,365,509)	37,090,223
Cash and cash equivalents, beginning of period	45,323,062	28,424,631	0
Cash and cash equivalents, end of period	37,090,223	25,059,122	37,090,223
Supplemental disclosure of cash flow information:
Cash paid for interest	$ 0	$ 0	$ 224,328