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Condensed Consolidated Statements of Comprehensive Loss - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Condensed Consolidated Statements of Comprehensive Loss        
Net loss $ (15,238) $ (26,599) $ (84,899) $ (84,135)
Other comprehensive (loss) gain:        
Unrealized (loss) gain on marketable debt securities (83) 44 (6) (23)
Comprehensive loss $ (15,321) $ (26,555) $ (84,905) $ (84,158)