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Condensed Consolidated Statements of Comprehensive Loss - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Statement Of Income And Comprehensive Income [Abstract]        
Net loss $ (24,168) $ (32,886) $ (77,224) $ (84,549)
Other comprehensive income:        
Cumulative translation gain (loss)   1 (1) 4
Comprehensive loss $ (24,168) $ (32,885) $ (77,225) $ (84,545)