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SHARE-BASED COMPENSATION - Options to Employees (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 12 Months Ended
Sep. 30, 2010
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
SHARE-BASED COMPENSATION          
Maximum aggregate number of shares to be issued 2,330,000        
Annual percentage increase in authorized shares on the first day of each of 2007, 2008 and 2009 prior to the year of amendment for awards other than incentive option shares 1.00%        
Annual percentage increase in authorized shares on the first day of each calendar year from the year of amendment for awards other than incentive option shares 2.50%        
Number of shares to be granted after expiration   0      
Expiry term of share options   10 years      
Number of Options          
Granted (in shares)   0 0 0  
Options          
Options to Employees          
Total unrecognized compensation expense related to share-based compensation awards   $ 0      
Recognized compensation expense   $ 44 $ 355 $ 1,321  
Term for which the entity is listed         7 years
Assumptions used to estimate the fair value of stock options granted          
Dividend yield (as a percent)   0.00%      
Number of Options          
Options outstanding at the beginning of the period (in shares)   675,709      
Exercised (in shares)   (184,873)      
Forfeited (in shares)   (24,550)      
Options outstanding at the end of the period (in shares)   466,286 675,709    
Options vested or expected to be vested at the end of the period (in shares)   466,286      
Options exercisable at the end of the period (in shares)   466,286      
Weighted Average Exercise Price          
Options outstanding at the beginning of the period (in dollars per share)   $ 12.44      
Exercised (in dollars per share)   3.47      
Forfeited (in dollars per share)   40.40      
Options outstanding at the end of the period (in dollars per share)   14.52 $ 12.44    
Options vested or expected to be vested at the end of the period (in dollars per share)   14.52      
Options exercisable at the end of the period (in dollars per share)   $ 14.52      
Weighted Average Remaining Contract Terms          
Options outstanding at the end of the period   3 years 3 years    
Options vested or expected to be vested at the end of the period   3 years      
Options exercisable at the end of the period   3 years      
Aggregate Intrinsic Value          
Options outstanding at the end of the period   $ 1,081 $ 12,354    
Options vested or expected to be vested at the end of the period   1,081      
Options exercisable at the end of the period   $ 1,081      
Weighted average grant-date fair value of options granted (in dollars per share)   $ 0.00 $ 0.00 $ 0.00  
Total intrinsic value of options exercised   $ 2,643 $ 3,422 $ 7,493