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SELECTED QUARTERLY FINANCIAL INFORMATION (UNAUDITED) (Details) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
SELECTED QUARTERLY FINANCIAL INFORMATION (UNAUDITED)                      
Revenues $ 225,000 $ 181,000 $ 112,000 $ 765,000 $ 689,000 $ 636,000 $ 130,000 $ 1,254,000 $ 1,283,000 $ 2,709,000 $ 2,438,000
Operating expenses 9,500,000 8,914,000 9,077,000 12,750,000 19,173,000 16,513,000 18,609,000 20,172,000 40,241,000 74,467,000 98,554,000
Net loss (9,281,000) (8,254,000) (8,947,000) (11,897,000) (15,863,000) (15,953,000) (18,326,000) (18,739,000) (38,379,000) (68,881,000) (96,853,000)
Basic and diluted net loss per share (in dollars per share) $ (0.07) $ (0.06) $ (0.07) $ (0.09) $ (0.12) $ (0.13) $ (0.14) $ (0.15) $ (0.30) $ (0.54) $ (0.78)
Restructuring charges $ 430,000       $ 2,702,000       $ 1,462,000 $ 2,702,000 $ 5,449,000