CONSOLIDATED BALANCE SHEETS (USD $)	Dec. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 45,323,062	$ 28,424,631
Prepaid contract research and manufacturing	915,222	175,192
Other prepaid expenses and other current assets	219,660	176,181
Total current assets	46,457,944	28,776,004
Property and equipment, net	44,578	151,544
Total Assets	46,502,522	28,927,548
Current liabilities:
Accounts payable	1,363,485	788,073
Accrued compensation and related expenses	213,313	199,935
Accrued restructuring	270,419	841,184
Accrued contract research and manufacturing	372,239	496,901
Other accrued expenses	1,027,394	685,305
Total current liabilities	3,246,850	3,011,398
Commitments
Stockholders' equity:
Preferred stock, $0.0001 par value, 5,000,000 shares authorized, no shares issued and outstanding	0	0
Common stock, $0.0001 par value, 200,000,000 and 100,000,000 shares authorized, 78,433,916 and 67,075,779 shares issued amd outstanding, respectively	7,843	6,708
Additional paid-in capital	274,725,472	240,970,852
Deficit accumulated during the development stage	(231,477,643)	(215,061,410)
Total stockholders' equity	43,255,672	25,916,150
Total liabilities and stockholders' equity	$ 46,502,522	$ 28,927,548