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Consolidated Statements of Comprehensive Loss (unaudited) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Statement of Comprehensive Income [Abstract]        
Net loss $ (50,969) $ (33,738) $ (79,751) $ (80,270)
Other comprehensive loss:        
Unrealized gain (loss) on marketable securities 33 31 (50) 0
Foreign currency translation (loss) gain (260) 983 (2,291) 4,498
Comprehensive loss $ (51,196) $ (32,724) $ (82,092) $ (75,772)