CONDENSED CONSOLIDATED BALANCE SHEETS (USD $)	Mar. 31, 2013	Dec. 31, 2012
Assets
Cash and cash equivalents	$ 25,059,122	$ 28,424,631
Prepaid contract research and manufacturing	91,677	175,192
Other prepaid expenses and other current assets	447,831	176,181
Total current assets	25,598,630	28,776,004
Property and equipment, net	121,635	151,544
Total Assets	25,720,265	28,927,548
Liabilities and Stockholders' Equity
Accounts payable	898,025	788,073
Accrued compensation and related expenses	373,192	199,935
Accrued restructuring	648,171	841,184
Accrued contract research and manufacturing	378,453	496,901
Other accrued expenses	797,619	685,305
Total liabilities	3,095,460	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, 100,000,000 shares authorized, 67,075,779 shares issued and outstanding	6,708	6,708
Additional paid-in capital	241,596,726	240,970,852
Deficit accumulated during the development stage	(218,978,629)	(215,061,410)
Total stockholders' equity	22,624,805	25,916,150
Total liabilities and stockholders' equity	$ 25,720,265	$ 28,927,548