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Consolidated Statements of Comprehensive Loss - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Consolidated Statements of Comprehensive Loss        
Net loss $ (43,223) $ (27,282) $ (119,499) $ (66,484)
Other comprehensive loss:        
Unrealized loss on marketable securities (483) (159) (582) (139)
Foreign currency translation (loss)/ gain (149)   192  
Comprehensive loss $ (43,855) $ (27,441) $ (119,889) $ (66,623)