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CONCENTRATION OF RISK - Long-Lived Assets (Net) by Geographic Area (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Segment Reporting Information [Line Items]    
Total long-lived assets $ 88,350 $ 87,872
United States [Member]    
Segment Reporting Information [Line Items]    
Total long-lived assets 79,969 80,027
Other [Member]    
Segment Reporting Information [Line Items]    
Total long-lived assets $ 8,381 $ 7,845