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Condensed Balance Sheets (Parenthetical) - $ / shares
Sep. 30, 2021
Dec. 31, 2020
Dec. 31, 2019
Condensed Balance Sheets      
Common stock shares outstanding 29,270,502 29,270,502 2,661,316
Common stock, par value $ 0.01 $ 0.01 $ 0.01
Common stock shares authorized 100,000,000 100,000,000 100,000,000
Common stock shares issued 29,270,502 29,270,502 2,661,316