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Condensed Consolidated Statements of Comprehensive Loss - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Statement of Comprehensive Income [Abstract]    
Net loss $ (8,060) $ (16,114)
Foreign currency translation adjustment 3,177 1,047
Total comprehensive loss $ (4,883) $ (15,067)