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Condensed Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Statement Of Income And Comprehensive Income [Abstract]        
Net loss $ (7,694) $ (5,793) $ (19,218) $ (15,808)
Other comprehensive income:        
Unrealized (loss) gain on available-for-sale securities (28) 4 (24) 5
Total comprehensive loss $ (7,722) $ (5,789) $ (19,242) $ (15,803)