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Consolidated Statements of Comprehensive Loss (unaudited) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Statement of Comprehensive Income [Abstract]    
Net loss $ (29,057) $ (41,233)
Other comprehensive loss:    
Unrealized (loss) gain on marketable securities, net of tax (22) 658
Foreign currency translation gain 631 1,626
Comprehensive loss $ (28,448) $ (38,949)