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Condensed Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Statement Of Financial Position [Abstract]    
Prepaid expense and other current assets, related party amounts $ 60 $ 0
Accounts payable, related party amounts 20 20
Accrued expenses and other current liabilities, related party amounts $ 10 $ 0
Convertible preferred stock, par value $ 0.0001 $ 0.0001
Convertible preferred stock, authorized 0 22,500,000
Convertible preferred stock, issued 0 22,012,499
Convertible preferred stock, outstanding 0 22,012,499
Convertible preferred stock, liquidation preference $ 0 $ 45,625
Common stock, par value $ 0.0001 $ 0.0001
Common stock, shares authorized 200,000,000 60,000,000
Common stock, shares issued 55,654,833 16,604,774
Common stock, shares outstanding 55,224,420 15,957,821