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WARRANTS (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 11, 2015
Oct. 26, 2015
Dec. 31, 2016
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%    
Beginning balance     $ 25,265  
Fair value change of the Warrants included in earnings     (24,554) $ (8,887)
Ending balance     $ 711 $ 25,265
Minimum        
Fair value assumptions and methodology for Warrants        
Exercise price (per share)     $ 24.48  
Risk-free interest rate (as a percent)     0.85%  
Time to maturity (in years)     9 months 26 days  
Expected volatility (as a percent)     53.99%  
Maximum        
Fair value assumptions and methodology for Warrants        
Exercise price (per share)     $ 28.08  
Risk-free interest rate (as a percent)     0.875%  
Time to maturity (in years)     11 months 9 days  
Expected volatility (as a percent)     59.21%  
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