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NET LOSS PER SHARE - Outstanding potentially dilutive options, warrants and convertible notes (Details)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Earnings Per Share [Abstract]      
Options outstanding 89,225 86,283 52,363
Warrants outstanding 81,044   84,127
Common stock underlying convertible notes outstanding 120,320   39,921