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Condensed Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Statement Of Income And Comprehensive Income [Abstract]    
Net loss $ (38,958) $ (25,287)
Other comprehensive income (loss), net of tax:    
Unrealized loss on marketable securities available-for-sale (22) (29)
Cumulative foreign currency translation adjustments 690 303
Total other comprehensive income 668 274
Total comprehensive loss $ (38,290) $ (25,013)