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Consolidated Statements of Comprehensive Loss - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Statement of Comprehensive Income [Abstract]      
Net loss $ (142,110) $ (170,447) $ (93,753)
Other comprehensive loss:      
Unrealized gain (loss) on marketable securities, net of tax 386 (202) (457)
Foreign currency translation loss (671) (261) (350)
Comprehensive loss $ (142,395) $ (170,910) $ (94,560)