Annual report pursuant to Section 13 and 15(d)

STOCK-BASED COMPENSATION (Details 2)

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STOCK-BASED COMPENSATION (Details 2) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Nov. 06, 2002
Share-based Compensation, Stock Options, Activity [Line Items]        
Outstanding - Number of Shares Issuable Upon Exercise of Outstanding Options, Beginning Balance 6,439,188 4,827,638   0
Options acquired in a business combination - Number of Shares Issuable Upon Exercise of Outstanding Options     49,159  
Granted - Number of Shares Issuable Upon Exercise of Outstanding Options 6,885,573 1,956,650 6,240,083  
Canceled - Number of Shares Issuable Upon Exercise of Outstanding Options (189,040) (1,666)    
Canceled - Number of Shares Issuable Upon Exercise of Outstanding Options     (1,001,728)  
Forfeited - Number of Shares Issuable Upon Exercise of Outstanding Options (442,555) (343,434) (459,876)  
Outstanding - Number of Shares Issuable Upon Exercise of Outstanding Options, Ending Balance 12,693,166 6,439,188 4,827,638 0
Vested - Number of Shares Issuable Upon Exercise of Outstanding Options 4,906,718      
Unvested - Number of Shares Issuable Upon Exercise of Outstanding Options 7,786,448      
Exercisable - Number of Shares Issuable Upon Exercise of Outstanding Options 4,906,718      
Options acquired in a business combination - Weighted Average Exercise Price (in dollars per share)     $ 100.52  
Granted - Weighted Average Exercise Price (in dollars per share) $ 0.46 $ 0.75 $ 1.35  
Canceled - Weighted Average Exercise Price (in dollars per share) $ 5.89 $ 0.45    
Canceled - Weighted Average Exercise Prices (in dollars per share)     $ 3.80  
Forfeited - Weighted Average Exercise Price (in dollars per share) $ 0.78 $ 1.38 $ 2.46  
Outstanding - Weighted Average Exercise Price, Ending Balance (in dollars per share) $ 0.91 $ 1.52 $ 1.82  
Vested - Weighted Average Exercise Price (in dollars per share) $ 1.55      
Unvested - Weighted Average Exercise Price (in dollars per share) $ 0.50      
Exercisable - Weighted Average Exercise Price (in dollars per share) $ 1.55      
Vested - Weighted Average Remaining Contracted Term in Years 4 years 2 months 1 day      
Unvested - Weighted Average Remaining Contracted Term in Years 9 years 7 months 20 days      
Exercisable - Weighted Average Remaining Contracted Term in Years 4 years 2 months 1 day      
Vested - Aggregate Intrinsic Value (in dollars) $ 0      
Unvested - Aggregate Intrinsic Value (in dollars) 134,400      
Exercisable - Aggregate Intrinsic Value (in dollars) $ 0