CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Current Assets:
Cash and cash equivalents	$ 1,200	$ 18,130
Available-for-sale securities	49,999	50,027
Prepaid expenses and other current assets	4,798	3,718
Total Current Assets	55,997	71,875
Property and equipment, net	589	589
Security deposits	163	94
Total Assets	56,749	72,558
Current Liabilities:
Accounts payable	12,223	13,542
Accrued expenses	5,713	2,134
Total Current Liabilities	17,936	15,676
Derivative financial instruments, at estimated fair value-warrants	555	1,534
Total Liabilities	18,491	17,210
Stockholders' Equity:
Preferred stock, Authorized 20,000,000 shares, at June 30, 2014 and December 31, 2013, none outstanding
Common stock, par value of $.0001 authorized 200,000,000 shares at June 30, 2014 and December 31, 2013. Issued and outstanding 94,109,263 and 90,182,115 shares at June 30, 2014 and December 31, 2013, respectively.	10	10
Additional paid-in capital	251,570	226,515
Accumulated deficit	(213,322)	(171,177)
Total Stockholders' Equity	38,258	55,348
Total Liabilities and Stockholders' Equity	$ 56,749	$ 72,558