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Consolidated Statements of Comprehensive Loss - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Consolidated Statements of Comprehensive Loss    
Net loss $ (41,233) $ (37,915)
Other comprehensive loss:    
Unrealized gain on marketable securities 658 125
Foreign currency translation gain (loss) 1,626 (124)
Comprehensive loss $ (38,949) $ (37,914)