CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2012
Current Assets:
Cash and cash equivalents	$ 12,769	$ 18,130	$ 12,064	$ 12,416
Available-for-sale securities	19,999	50,027
Prepaid expenses and other current assets	4,106	3,718
Total Current Assets	36,874	71,875
Property and equipment, net	607	589
Security deposits	163	94
Total Assets	37,644	72,558
Current Liabilities:
Accounts payable	15,246	13,542
Accrued expenses	3,355	2,134
Total Current Liabilities	18,601	15,676
Derivative financial instruments, at estimated fair value-warrants	130	1,534
Total Liabilities	18,731	17,210
Stockholders' Equity:
Preferred stock, Authorized 20,000,000 shares, at September 30, 2014 and December 31, 2013, none outstanding
Common stock, par value of $.0001 authorized 200,000,000 shares at September 30, 2014 and December 31, 2013. Issued and outstanding 94,796,244 and 90,182,115 shares at September 30, 2014 and December 31, 2013, respectively.	10	10
Additional paid-in capital	255,233	226,515
Accumulated deficit	(236,330)	(171,177)
Total Stockholders' Equity	18,913	55,348
Total Liabilities and Stockholders' Equity	$ 37,644	$ 72,558