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Consolidated Statements of Comprehensive Loss - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Statement Of Income And Comprehensive Income [Abstract]      
Net loss $ (152,600) $ (158,899) $ (95,154)
Other comprehensive (loss) income, net of tax:      
Unrealized gain (loss) on marketable securities available-for-sale 140 12 (83)
Cumulative foreign currency translation adjustments (512) (1,146) 2,826
Total other comprehensive (loss) income (372) (1,134) 2,743
Total comprehensive loss $ (152,972) $ (160,033) $ (92,411)