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Unaudited Consolidated Statements of Comprehensive Loss - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Statement Of Income And Comprehensive Income [Abstract]        
Net loss $ (26,135) $ (17,535) $ (71,824) $ (36,947)
Other comprehensive income (loss):        
Foreign currency translation 1 8 19 43
Comprehensive loss $ (26,134) $ (17,527) $ (71,805) $ (36,904)