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Consolidated Statements of Comprehensive Loss - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Consolidated Statements of Comprehensive Loss      
Net loss $ (170,447) $ (93,753) $ (51,574)
Other comprehensive loss:      
Unrealized (loss)/gain on marketable securities (202) (457) 70
Foreign currency translation loss (261) (350)  
Comprehensive loss $ (170,910) $ (94,560) $ (51,504)