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Basis of Presentation and Significant Accounting Policies - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Accounting Policies [Line Items]          
Income tax provision $ 0 $ 0 $ 0 $ 0  
Money Market Funds [Member]          
Accounting Policies [Line Items]          
Money market funds $ 84,810   84,810   $ 52,301
Unrealized gains or losses on securities     $ 0   $ 0