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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Statement of Comprehensive Income [Abstract]    
Net loss $ (10,873) $ (7,367)
Other comprehensive gain    
Currency translation adjustments 23 0
Total comprehensive loss $ (10,850) $ (7,367)