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INCOME TAXES - Tax Expense (Benefit) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]      
Effect of movement in deferred tax balances $ 118 $ 431 $ 27
Effect of adjustments in respect of current tax in prior periods 86 (369) (5)
Effect of taxable income in various countries 820 1,205 1,483
Total income tax expense 1,024 $ 1,267 $ 1,505
Deferred tax assets 1,100    
Deferred tax liabilities $ 1,700