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Consolidated Statements of Comprehensive Loss - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Consolidated Statements of Comprehensive Loss      
Net loss $ (284,002) $ (200,042) $ (132,118)
Other comprehensive gain/ (loss):      
Foreign currency translation adjustment (3,604) 1,945  
Unrealized (loss)/gain on available-for-sale securities (538) 217 17
Other comprehensive (loss)/ income (4,142) 2,162 17
Comprehensive loss $ (288,144) $ (197,880) $ (132,101)