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NOTES RECEIVABLE - Additional Information (Details) $ in Millions				12 Months Ended
	Mar. 31, 2023 USD ($) D	Jul. 14, 2022 USD ($)	Sep. 29, 2021 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Greenbrook TMS Inc | Secured Promissory Note
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term of notes receivable	4 years
Interest rate (as a percent)	7.65%
Percentage of unpaid amount	200.00%
Discount rate	20.00%
Number of day volume-weighted average closing price | D	30
Principal amount of notes receivable	$ 6.0
Success TMS
Accounts, Notes, Loans and Financing Receivable [Line Items]
Repayment of notes issued		$ 10.5
Success TMS | Secured Promissory Note
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term of master sales agreement			5 years
Term of notes receivable			5 years
Principal amount of notes receivable			$ 10.0
Success TMS | Secured Promissory Note | Other income, net
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income recognized				$ 0.6	$ 1.0	$ 0.2

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-15

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