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NATURE OF BUSINESS AND OVERVIEW (Details) (USD $) | 1 Months Ended | 2 Months Ended | 3 Months Ended | 12 Months Ended | 1 Months Ended
--- | --- | --- | --- | --- | ---
May 30, 2011 | Mar. 31, 2012 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Feb. 28, 2013 Subsequent event | Jan. 31, 2013 Subsequent event
NATURE OF BUSINESS AND OVERVIEW |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash, cash equivalents and marketable securities |  |  | $ 84,000,000 |  |  |  |  |  |  |  | $ 84,000,000 |  |  |  |
Working capital |  |  | 67,400,000 |  |  |  |  |  |  |  | 67,400,000 |  |  |  |
Term Loan |  |  | 11,300,000 |  |  |  |  |  |  |  | 11,300,000 |  |  |  |
Net Loss |  |  | (16,807,000) | (15,027,000) | (13,773,000) | (13,516,000) | (12,732,000) | (11,772,000) | (10,236,000) | (10,059,000) | (59,123,000) | (44,799,000) | (2,533,000) |  |
Net cash used in operations |  |  |  |  |  |  |  |  |  |  | (49,782,000) | (35,658,000) | (30,372,000) |  |
Shares of common stock sold under the Cantor Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  | 13,800,000 | 2,433,608
Net proceeds from sale of common stock |  |  |  |  |  |  |  |  |  |  | 83,784,000 | 36,023,000 | 1,014,000 | 97,000,000 | 17,100,000
Common stock in an underwritten public offering issued (in shares) | 11,500,000 | 12,075,000 |  |  |  |  |  |  |  |  |  |  |  | 13,800,000 |
Amount raised from shares issued in underwritten public offering | $ 33,700,000 | $ 43,400,000 |  |  |  |  |  |  |  |  | $ 43,483,000 | $ 33,695,000 |  | $ 97,000,000 |

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