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Consolidated Statements of Comprehensive Loss (unaudited) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Statement of Comprehensive Income [Abstract]        
Net loss $ (17,475) $ (38,914) $ (46,532) $ (80,147)
Other comprehensive loss:        
Unrealized (loss) gain on marketable securities, net of tax (9) (40) (31) 618
Foreign currency translation gain (loss) 2,884 (159) 3,515 1,467
Comprehensive loss $ (14,600) $ (39,113) $ (43,048) $ (78,062)