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RECEIVABLES, PREPAIDS AND OTHER ASSETS (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Receivables, prepaids and other assets      
Government sales tax receivable $ 1,776   $ 1,810
Prepaids and other assets 3,726   3,880
Receivables and other current assets 5,502   5,690
VAT collected 1,000 $ 500  
Mexican Tax Authority      
Receivables, prepaids and other assets      
Government sales tax receivable $ 600   $ 900