Quarterly report pursuant to Section 13 or 15(d)

STOCK-BASED COMPENSATION (Details 2)

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STOCK-BASED COMPENSATION (Details 2) (USD $)
 3 Months Ended
Mar. 31, 2013
Outstanding - Number of Shares Issuable Upon Exercise of Outstanding Options, Beginning Balance 6,439,188
Granted - Number of Shares Issuable Upon Exercise of Outstanding Options 20,000
Forfeited - Number of Shares Issuable Upon Exercise of Outstanding Options (167,550)
Outstanding - Number of Shares Issuable Upon Exercise of Outstanding Options, Ending Balance 6,291,638
Vested - Number of Shares Issuable Upon Exercise of Outstanding Options 2,884,651
Unvested - Number of Shares Issuable Upon Exercise of Outstanding Options 3,406,987
Exercisable - Number of Shares Issuable Upon Exercise of Outstanding Options 2,884,651
Outstanding - Weighted Average Exercise Price, Beginning Balance (in dollars per share) $ 1.52
Granted - Weighted Average Exercise Price (in dollars per share) $ 0.74
Forfeited - Weighted Average Exercise Price (in dollars per share) $ 0.75
Outstanding - Weighted Average Exercise Price, Ending Balance (in dollars per share) $ 1.54
Vested - Weighted Average Exercise Price (in dollars per share) $ 2.33
Unvested - Weighted Average Exercise Price (in dollars per share) $ 0.88
Exercisable - Weighted Average Exercise Price (in dollars per share) $ 2.33
Vested - Weighted Average Remaining Contracted Term in Years 8 years 3 months 26 days
Unvested - Weighted Average Remaining Contracted Term in Years 9 years 7 days
Exercisable - Weighted Average Remaining Contracted Term in Years 8 years 3 months 26 days
Vested - Aggregate Intrinsic Value (in dollars) $ 6,824
Unvested - Aggregate Intrinsic Value (in dollars) 7,677
Exercisable - Aggregate Intrinsic Value (in dollars) $ 6,824