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STOCK-BASED COMPENSATION Restricted Stock Units (Details) (Restricted Stock Units (RSUs) [Member], USD $)
6 Months Ended
Jun. 30, 2013
Number of Shares/Units:  
Unvested at December 31, 2012 584,000
Granted 670,500
Granted - option exchange program 545,136
Vested (235,500)
Forfeited (76,250)
Unvested at June 30, 2013 1,487,886
Weighted-Average Grant Date Fair Value:  
Unvested at December 31, 2012 $ 5.61
Granted $ 2.60
Granted - option exchange program $ 3.27
Vested $ 5.48
Forfeited $ 4.81
Unvested at June 30, 2013 $ 3.46
Intrinsic value $ 4,900,000
Unrecognized compensation expense $ 6,800,000
Weighted average period for recognition 3 years 2 months 12 days
Minimum [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Award vesting period 1 year
Maximum [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Award vesting period 4 years