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SHARE OPTIONS - Summary of Stock Option Activity (Details) - 2008 Plan - Share options - $ / shares
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Options granted              
Balance at the beginning of the period (in shares) 619,650            
Granted (in shares)   44,000 120,000 4,000 546,400 1,797,300 307,250
Exercised (in shares) (93,000)            
Forfeited (in shares) (321,950)            
Balance at the end of the period (in shares) 204,700 619,650          
Weighted average exercise price per option              
Balance at the beginning of the period (in dollars per share) $ 1.61            
Granted (in dollars per share)       $ 1.40 $ 2.25   $ 4.75
Exercised (in dollars per share) 0.01            
Forfeited (in dollars per share) 1.58            
Balance at the end of the period (in dollars per share) $ 2.39 $ 1.61