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CONCENTRATION OF RISK - Long-Lived Assets (Net) by Geographic Area (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Segment Reporting Information [Line Items]    
Total long-lived assets $ 49,358 $ 27,203
UNITED STATES    
Segment Reporting Information [Line Items]    
Total long-lived assets 47,695 26,917
Other [Member]    
Segment Reporting Information [Line Items]    
Total long-lived assets $ 1,663 $ 286