NATURE OF OPERATIONS, BASIS OF PRESENTATION, AND GOING CONCERN (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		100 Months Ended			0 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	May 09, 2014 Subsequent event
Going concern disclosures
Accumulated loss	$ 87,012		$ 87,012	$ 81,909
Net loss	5,103	13,326	87,012
Cash used in operations	4,194	2,669	43,522
Cash balance	9,846	10,301	9,846	13,980	12,825
Number of shares issued under underwritten public offering (in shares)						14,001,250
Warrants for purchase of common stock (in shares)						7,000,625
Share price (in dollars per share)						$ 1.15
Warrants proceeds (in dollars per share)						$ 0.00001
Net proceeds from common stock and warrants, after deducting underwriting discounts and offering expenses	$ 116	$ 341	$ 50,341			$ 14,600