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Consolidated Statements of Comprehensive Loss (unaudited) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Statement of Comprehensive Income [Abstract]    
Net loss $ (72,113) $ (19,263)
Other comprehensive loss:    
Unrealized gain (loss) on marketable securities 59 (123)
Foreign currency translation (loss) gain (716) 1,107
Comprehensive loss $ (72,770) $ (18,279)