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INCOME TAXES - Tax Expense (Benefit) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
Statutory tax rate 0.00% 0.00% 0.00%
Effect of movement in deferred tax balances $ 172 $ 118 $ 431
Effect of adjustments in respect of current tax in prior periods 37 86 (369)
Effect of taxable income in various countries 772 820 1,205
Total income tax expense 981 1,024 $ 1,267
Deferred tax liabilities $ 600 $ 1,700