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REVENUE (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
REVENUE          
Contract liability balances related to performance obligations $ 272   $ 272   $ 272
Recognized revenue related to contract liability balances 0 $ 0 0 $ 37  
Contract with Customer, Asset, before Allowance for Credit Loss $ 0   $ 0   $ 0