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Condensed Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Statement Of Income And Comprehensive Income [Abstract]    
Net loss $ (39,672) $ (38,958)
Other comprehensive (loss) income, net of tax:    
Unrealized gain (loss) on marketable securities available-for-sale 67 (22)
Foreign currency translation adjustments (483) 690
Total other comprehensive (loss) income (416) 668
Total comprehensive loss $ (40,088) $ (38,290)