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Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Statement Of Income And Comprehensive Income [Abstract]    
Net loss $ (2,964) $ (2,495)
Other comprehensive income:    
Foreign currency translation adjustment, net 375 41
Total comprehensive loss $ (2,589) $ (2,454)