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Goodwill and Intangible Assets - Aggregate Amortization expense (Details) - TOI Parent Inc. - USD ($)
Sep. 30, 2021
Dec. 31, 2020
Dec. 31, 2019
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]      
Remainder of 2021 $ 625,189 $ 2,450,757  
2022 2,500,757 2,450,757  
2023 2,500,757 2,450,757  
2024 2,500,757 2,450,757  
2025 2,500,757 2,450,757  
Thereafter 7,528,450 7,261,784  
Total $ 18,156,667 $ 19,515,569 $ 22,002,646