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RECEIVABLES, PREPAIDS AND OTHER ASSETS (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Receivables, prepaids and other assets      
Government sales tax receivable $ 1,453   $ 2,658
Prepaids and other assets 3,702   2,607
Receivables and other current assets 5,155   5,265
VAT collected 1,100 $ 1,300  
Mexican Tax Authority      
Receivables, prepaids and other assets      
Government sales tax receivable $ 700   $ 700