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Unaudited 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 $ (27,419) $ (41,367)
Currency translation adjustments (834) 226
Comprehensive loss $ (28,253) $ (41,141)