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Consolidated Statements of Comprehensive Loss (unaudited) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Statement of Comprehensive Income [Abstract]        
Net loss $ (9,520) $ (17,475) $ (28,782) $ (46,532)
Other comprehensive loss:        
Unrealized gain (loss) on marketable securities 40 (9) (83) (31)
Foreign currency translation gain (3,138) 2,884 (2,031) 3,515
Comprehensive loss $ (12,618) $ (14,600) $ (30,896) $ (43,048)