RECEIVABLES AND OTHER CURRENT ASSETS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Tax Credit Carryforward [Line Items]
Government sales tax receivable	$ 2,658	$ 2,079
Other current assets	2,607	1,686
Receivables and other current assets	5,265	3,765
VAT collected	2,200	8,300	$ 5,900
Mexican Tax Authority
Tax Credit Carryforward [Line Items]
Government sales tax receivable	$ 700	$ 1,100