Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Current Assets:
Cash	$ 99,521	$ 40,199
Prepaid and other current assets	510	393
Total current assets	100,031	40,592
Property & equipment, net	447	51
Other assets	104	349
Total Assets	100,582	40,992
Current Liabilities:
Accounts payable	468	1,029
Interest payable	109	119
Accrued expenses	4,430	2,185
Current portion of note payable	6,203	1,799
Total current liabilities	11,210	5,132
Note payable	7,017	12,386
Other long-term liabilities	1,077	1,441
Total Liabilities	19,304	18,959
Commitments and Contingencies (Note 6)
Stockholders' Equity:
Common stock, $.001 par value, 100,000,000 and 50,000,000 shares authorized, 39,652,950 and 24,400,754 shares issued and outstanding as of December 31, 2013 and 2012, respectively	40	24
Additional paid-in capital	202,580	106,193
Deficit accumulated during development stage	(121,342)	(84,184)
Total Stockholders’ Equity	81,278	22,033
Total Liabilities and Stockholders’ Equity	100,582	40,992
Series C Convertible Preferred Stock [Member]
Stockholders' Equity:
Convertible Preferred stock, $.001 par value, 129,767 and 584,390 Series C shares authorized, 0 shares issued and outstanding as of December 31, 2013 and 2012, respectively	$ 0	$ 0