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SEGMENT AND GEOGRAPHICAL REPORTING - Property and Equipment by Geographical Location (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Segment Reporting Information [Line Items]    
Property and equipment, net $ 56,899 $ 63,703
Reportable Geographical Components | United States    
Segment Reporting Information [Line Items]    
Property and equipment, net 52,000 56,000
Reportable Geographical Components | Canada    
Segment Reporting Information [Line Items]    
Property and equipment, net 5,000 8,000
Reportable Geographical Components | Other    
Segment Reporting Information [Line Items]    
Property and equipment, net $ 0 $ 0