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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 $ (8,512) $ (8,363) $ (21,336) $ (22,709)
Other comprehensive income (loss):        
Unrealized gain (loss) on available-for-sale securities (100) 11 (112) 22
Comprehensive loss $ (8,612) $ (8,352) $ (21,448) $ (22,687)