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SHARE-BASED COMPENSATION, Stock Options (Details) - USD ($)
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted (in shares) 691,205 1,577,385
Stock Option [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Outstanding, Beginning Balance (in shares) 3,573,141  
Granted (in shares) 691,205  
Exercised (in shares) 0  
Forfeitures (in shares) (4,335)  
Outstanding, Ending Balance (in shares) 4,260,011  
Eligible for exercise (in shares) 2,126,747  
Outstanding, Beginning Balance (in dollars per share) $ 4.27  
Granted (in dollars per share) 8.82  
Exercised (in dollars per share) 0  
Forfeitures (in dollars per share) 2.79  
Outstanding, Ending Balance (in dollars per share) 5.01  
Eligible for exercise (in dollars per share) $ 4.99  
Intrinsic Value, Options outstanding $ 15,674  
Intrinsic Value, Options exercisable $ 7,669  
Weighted Average Remaining Life in Years, Options outstanding 9 years 2 months 12 days  
Weighted Average Remaining Life in Years, Options exercisable 9 years  
Intrinsic value of exercised options $ 0  
Unvested stock options outstanding (in shares) 2,133,264  
Compensation expense not yet recognized $ 2,500,000  
Weighted average remaining vesting period for unrecognized compensation expense 1 year  
Unvested shares expected to vest (in shares) 2,133,264  
Weighted average remaining life 9 years 2 months 12 days  
Weighted average exercise price (in dollars per share) $ 5.01  
Intrinsic value $ 15,700,000