Cover - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Mar. 06, 2023	Jun. 30, 2022
Document Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2022
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	001-39248
Entity Registrant Name	The Oncology Institute, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	84-3562323
Entity Address, Address Line One	18000 Studebaker Rd
Entity Address, Address Line Two	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
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
ICFR Auditor Attestation Flag	false
Entity Shell Company	false
Entity Public Float			$ 125.7
Entity Common Stock, Shares Outstanding		74,551,556
Documents Incorporated by Reference	Part III of this Form 10-K incorporates by reference information from the registrant’s proxy statement for the annual meeting of stockholders expected to be held on June 15, 2023.
Entity Central Index Key	0001799191
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	FY
Amendment Flag	false
Common Stock
Document Information [Line Items]
Title of 12(b) Security	Common Stock, $0.0001 par value per share
Trading Symbol	TOI
Security Exchange Name	NASDAQ
Warrant
Document Information [Line Items]
Title of 12(b) Security	Warrants to purchase common stock
Trading Symbol	TOIIW
Security Exchange Name	NASDAQ