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Consolidated Statements of Comprehensive Loss - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Consolidated Statements of Comprehensive Loss        
Net loss $ (38,361) $ (25,104) $ (76,276) $ (39,202)
Other comprehensive loss:        
Unrealized (loss)/gain on marketable securities (224) 10 (99) 20
Foreign currency translation gain 465   341  
Comprehensive loss $ (38,120) $ (25,094) $ (76,034) $ (39,182)