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Statement of Comprehensive Loss - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income Statement [Abstract]      
Net loss $ (43,200) $ (13,634) $ (26,483)
Other comprehensive loss       
    Unrealized loss on investment securities, available-for-sale (19)
Comprehensive loss $ (43,219) $ (13,634) $ (26,483)