CONDENSED CONSOLIDATED BALANCE SHEETS (USD $)	Mar. 31, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 37,090,223	$ 45,323,062
Prepaid contract research and manufacturing	624,991	915,222
Other prepaid expenses and other current assets	618,777	219,660
Total current assets	38,333,991	46,457,944
Property and equipment, net	28,495	44,578
Intangible asset, net	1,500,000	0
Total Assets	39,862,486	46,502,522
Current liabilities:
Accounts payable	1,701,163	1,363,485
Accrued compensation and related expenses	448,119	213,313
Accrued restructuring	40,162	270,419
Accrued contract research and manufacturing	204,040	372,239
Other accrued expenses	1,580,336	1,027,394
Total liabilities	3,973,820	3,246,850
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 shares authorized, 78,457,126 and 78,433,916 shares issued and outstanding	7,846	7,843
Additional paid-in capital	275,432,123	274,725,472
Deficit accumulated during the development stage	(239,551,303)	(231,477,643)
Total stockholders' equity	35,888,666	43,255,672
Total liabilities and stockholders' equity	$ 39,862,486	$ 46,502,522