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OTHER RECEIVABLES - Allowance for Impairment of tax Credits (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Subclassifications of assets, liabilities and equities [abstract]      
Balance at beginning of year $ 675 $ 1,300 $ 0
Additions (47) 48 1,586
Foreign exchange (250) (673) (286)
Balance at end of year $ 378 $ 675 $ 1,300