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LEASE LIABILITIES - Rent Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of quantitative information about leases for lessee [abstract]    
Short-term leases $ 826 $ 2,298
Leases of low value assets 81 70
Variable lease payments 850 1,025
Rent expense relating to payments not included in the measurements of lease liabilities $ 1,757 $ 3,393