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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2019
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      
Options | Employees          
SHARE-BASED COMPENSATION          
Option exercised   103,723      
Weighted average exercise price of shares exercised (in dollars per share)   $ 8.47      
Total intrinsic value of options exercised (in dollars)   $ 1,422 $ 256 $ 605  
Options outstanding   120,779     120,779
Weighted average exercise price of options outstanding (in dollars per share)   $ 10.97     $ 10.97
Weighted average remaining contract terms of options outstanding (in years)   1 year      
Intrinsic value of outstanding options (in dollars)         $ 1,344
Number of Options          
Exercised (in shares)   (103,723)      
Options outstanding at the end of the period (in shares)   120,779      
Weighted Average Exercise Price          
Exercised (in dollars per share)   $ 8.47      
Options outstanding at the end of the period (in dollars per share)   $ 10.97      
Weighted Average Remaining Contract Terms          
Options outstanding at the end of the period   1 year      
Aggregate Intrinsic Value          
Options outstanding at the end of the period         $ 1,344
Total intrinsic value of options exercised   $ 1,422 $ 256 $ 605