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NATURE OF BUSINESS AND OVERVIEW (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
NATURE OF BUSINESS AND OVERVIEW |  |  |  |  |  |  |  |  |  |  |
Cash, cash equivalents and marketable securities | $ 303,000,000 |  |  |  |  |  |  |  | $ 303,000,000 |  |
Net Loss | (22,062,000) | (23,140,000) | (19,016,000) | (17,332,000) | (16,807,000) | (15,027,000) | (13,773,000) | (13,516,000) | (81,550,000) | (59,123,000) | (44,799,000)
Net cash used in operations |  |  |  |  |  |  |  |  | $ (67,669,000) | $ (49,782,000) | $ (35,658,000)

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