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RECEIVABLES AND OTHER CURRENT ASSETS (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Tax Credit Carryforward [Line Items]      
Trade receivable $ 1,294    
Government sales tax receivable 2,128   $ 2,079
Other current assets 1,183   1,686
Receivables and other current assets 4,605   3,765
VAT collected 1,000 $ 2,900  
Mexican Tax Authority      
Tax Credit Carryforward [Line Items]      
Government sales tax receivable $ 1,100   $ 1,100