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BUSINESS SEGMENTS - Net Sales and Long-Lived Assets by Major Geographic Locations (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]    
Total $ 45,620 $ 53,528
United States    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Total 16,985 23,455
Mexico    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Total 20,032 21,288
United Kingdom    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Total 8,157 8,353
Rest of World    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Total $ 446 $ 432