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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (UNAUDITED) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Statement of Comprehensive Income [Abstract]    
NET LOSS $ (20,055) $ (12,463)
OTHER COMPREHENSIVE LOSS:    
Foreign currency translation adjustments (508) (120)
TOTAL COMPREHENSIVE LOSS $ (20,563) $ (12,583)