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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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