| Cover Page | Apr. 01, 2022 |
| Document Information [Line Items] | |
| Document Type | 8-K |
| Document Period End Date | Apr. 1, 2022 |
| Entity Registrant Name | The Oncology Institute, Inc. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-39248 |
| Entity Tax Identification Number | 84-3562323 |
| Entity Address, Address Line One | 18000 Studebaker Rd, Suite 800 |
| Entity Address, City or Town | Cerritos |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 90703 |
| City Area Code | 562 |
| Local Phone Number | 735-3226 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | false |
| Entity Central Index Key | 0001799191 |
| Amendment Flag | false |
| Common Stock | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Common stock, par value $0.001 |
| Trading Symbol | TOI |
| Security Exchange Name | NASDAQ |
| Redeemable Warrants | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Redeemable warrants, each whole warrant exercisable for one share of Common stock, each at an exercise price of $11.50 per share |
| Trading Symbol | TOIIW |
| Security Exchange Name | NASDAQ |
