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Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Statement Of Income And Comprehensive Income [Abstract]        
Net loss $ (5,341) $ (575) $ (16,279) $ (13,253)
Other comprehensive (loss) gain:        
Unrealized (loss) gain on marketable securities (16) (34) (10) 116
Total comprehensive (loss) gain (16) (34) (10) 116
Comprehensive loss $ (5,357) $ (609) $ (16,289) $ (13,137)