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Condensed Consolidated Statements Comprehensive Loss - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Condensed Consolidated Statements of Comprehensive Loss        
Net loss $ (7,017) $ (8,419) $ (21,867) $ (27,282)
Other comprehensive (loss) income:        
Unrealized (loss) gain on available-for-sale securities   (12) 4 (3)
Total other comprehensive (loss) income:   (12) 4 (3)
Comprehensive loss $ (7,017) $ (8,431) $ (21,863) $ (27,285)