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Consolidated Statements of Comprehensive Loss (unaudited) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Statement of Comprehensive Income [Abstract]        
Net loss $ (59,997) $ (50,969) $ (173,899) $ (79,751)
Other comprehensive (loss) income:        
Unrealized (loss) gain on marketable securities (463) 33 435 (50)
Foreign currency translation loss (843) (260) (1,281) (2,291)
Comprehensive loss $ (61,303) $ (51,196) $ (174,745) $ (82,092)