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Condensed Consolidated Statements of Comprehensive Loss (Unaudited) - 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 $ (40,528) $ (22,128) $ (118,930) $ (67,733)
Other comprehensive (loss) income, net of tax:        
Unrealized (loss) gain on marketable securities available-for-sale (10) 14 (15) (31)
Foreign currency translation adjustments (167) 759 (791) 2,499
Total other comprehensive (loss) income (177) 773 (806) 2,468
Total comprehensive loss $ (40,705) $ (21,355) $ (119,736) $ (65,265)