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Debt- Short-term debt and current portion of long-term debt (Details) - USD ($)
Sep. 30, 2021
Dec. 31, 2020
Dec. 31, 2019
Debt      
Unamortized debt issuance costs $ 229,725    
TOI Parent Inc.      
Debt      
Short-term debt and current portion of long-term debt 4,895,275 $ 5,367,758  
Unamortized debt issuance costs 229,725 282,512 $ 0
TOI Parent Inc. | 1% Paycheck Protection Program Loan, due May 13, 2022      
Debt      
Short-term debt and current portion of long-term debt   2,000,000  
TOI Parent Inc. | 1% Small Business Administration Loan, due May 2, 2022      
Debt      
Short-term debt and current portion of long-term debt   2,992,758  
TOI Parent Inc. | Current portion of term loan payable      
Debt      
Short-term debt and current portion of long-term debt $ 5,125,000 $ 375,000