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Consolidated Statements of Comprehensive Loss - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement Of Income And Comprehensive Income [Abstract]      
Net loss $ (158,899) $ (95,154) $ (112,444)
Other comprehensive (loss) income, net of tax:      
Unrealized gain (loss) on marketable securities available-for-sale 12 (83) (8)
Cumulative foreign currency translation adjustments (1,146) 2,826 (686)
Total other comprehensive (loss) income (1,134) 2,743 (694)
Total comprehensive loss $ (160,033) $ (92,411) $ (113,138)