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Consolidated Statements of Comprehensive Loss - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Consolidated Statements of Comprehensive Loss    
Net loss $ (49,916) $ (54,992)
Other comprehensive (loss) gain:    
Foreign currency translation loss (1,805) (458)
Unrealized (loss) gain on available-for-sale securities (441) 83
Other comprehensive loss (2,246) (375)
Comprehensive loss $ (52,162) $ (55,367)