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CONCENTRATION OF RISK - Long-Lived Assets (Net) by Geographic Area (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Segment Reporting Information [Line Items]    
Total long-lived assets $ 27,203 $ 22,407
UNITED STATES    
Segment Reporting Information [Line Items]    
Total long-lived assets 26,917 22,187
Other [Member]    
Segment Reporting Information [Line Items]    
Total long-lived assets $ 286 $ 220