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Statements of Comprehensive Loss - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement Of Income And Comprehensive Income [Abstract]      
Net loss $ (81,355) $ (43,133) $ (22,711)
Other comprehensive income:      
Unrealized gain (loss) on investments (17) 43  
Comprehensive loss $ (81,372) $ (43,090) $ (22,711)