Consolidated Statements of Operations (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		100 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014
Operating expenses:
Research and development	$ 3,242	$ 1,213	$ 29,035
General and administrative	1,829	1,638	24,956
Total operating expenses	5,071	2,851	53,991
Operating loss	(5,071)	(2,851)	(53,991)
Other income (expense):
Other income			383
Interest income	1	3	72
Interest expense	(33)	(29)	(1,301)
Modification of warrants			(765)
Derivatives loss		(10,449)	(31,410)
Other expense, net	(32)	(10,475)	(33,021)
Net loss	$ (5,103)	$ (13,326)	$ (87,012)
Net loss per share, basic and diluted (in dollars per share)	$ (0.07)	$ (0.20)	$ (2.11)
Weighted average number of common shares outstanding, basic and diluted (in shares)	74,162,786	66,043,378	41,269,131