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Condensed Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Statement of Comprehensive Income [Abstract]    
Net loss $ (2,865) $ (2,390)
Other comprehensive income:    
Foreign currency translation adjustments 0 1
Comprehensive loss $ (2,865) $ (2,389)