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Basis of Presentation and Significant Accounting Policies - Income Taxes (Details) - USD ($)
Sep. 30, 2021
Dec. 31, 2020
Dec. 31, 2019
Summary of Significant Accounting Policies      
Deferred tax asset   $ 101,676 $ 483
Unrecognized tax benefits $ 0 0 0
Amounts accrued for the payment of interest and penalties $ 0 $ 0 $ 0