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WARRANTS (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 11, 2015
Oct. 26, 2015
Dec. 31, 2015
WARRANTS      
Fair value of Warrants   $ 16,378  
Fair value assumptions and methodology for Warrants      
Exercise price (per share) $ 28.08 $ 24.48  
Risk-free interest rate (as a percent) 0.935% 0.672%  
Dividend yield (as a percent)     0.00%
Time to maturity (in years) 2 years 2 years  
Expected volatility (as a percent) 65.13% 67.24%  
Warrants issued     $ 16,378
Fair value change of the Warrants included in earnings     (8,887)
Ending balance     $ 25,265
Minimum      
Fair value assumptions and methodology for Warrants      
Exercise price (per share)     $ 24.48
Risk-free interest rate (as a percent)     1.036%
Time to maturity (in years)     1 year 9 months 26 days
Expected volatility (as a percent)     63.38%
Maximum      
Fair value assumptions and methodology for Warrants      
Exercise price (per share)     $ 28.08
Risk-free interest rate (as a percent)     1.057%
Time to maturity (in years)     1 year 11 months 12 days
Expected volatility (as a percent)     63.88%
Senior secured term loan | Syndicated loan agreement arranged by Credit Suisse      
WARRANTS      
Face value of the loan   $ 180,000  
Loan term (in years)   2 years  
Maximum number of common stock could be purchased by Warrants 940,171 1,348,040  
Exercise price of warrant (in dollars per share) $ 28.08 $ 24.48