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Condensed Statements of Comprehensive Loss (Unaudited) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Income Statement [Abstract]    
Net loss $ (11,449) $ (7,794)
Unrealized gain (loss) on available-for-sale securities, net of tax 4 (3)
Comprehensive loss $ (11,445) $ (7,797)