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SHARE OPTIONS - Details of Share Options Granted (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Additional disclosures      
Share-based compensation expense $ 2,060 $ 405 $ 1,865
2008 Plan | Share options      
Options Number      
Outstanding (in shares) 204,700 619,650  
Exercisable (in shares) 200,700    
Expected to vest (in shares) 4,000    
Weighted-average exercise price per option      
Outstanding (in dollars per share) $ 2.39 $ 1.61  
Exercisable (in dollars per share) 2.42    
Expected to vest (in dollars per share) $ 0.89    
Weighted-average remaining contractual life (years)      
Outstanding 4 years 9 months 29 days    
Exercisable 4 years 9 months 7 days    
Expected to vest 7 years 9 months 29 days    
Additional disclosures      
Total intrinsic value of options exercised $ 539 $ 270 $ 324
Weighted average grant date fair value of options (in dollars per share) $ 0.00 $ 0.50 $ 0.70
Share-based compensation expense $ 66 $ 21 $ 97
Unrecognized compensation cost $ 9    
Weighted-average period of recognition of unrecognized compensation cost 1 year 9 months 29 days