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NOTES RECEIVABLE - Additional Information (Details) - Secured Promissory Note
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2023
USD ($)
D
Mar. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
If Maker's Common Shares Are Not Traded On Any Stock Markets      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Discount rate 20.00%    
Greenbrook TMS Inc      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Principal amount of notes receivable $ 6.0    
Term of notes receivable 4 years    
Notes receivable outstanding   $ 4.8 $ 5.2
Percentage of unpaid amount 200.00%    
Greenbrook TMS Inc | If Maker's Common Shares Are Traded On Nasdaq Stock Market      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Discount rate 20.00%    
Number of day volume-weighted average closing price | D 30    
Greenbrook TMS Inc | If Maker's Common Shares Are Traded On Stock Markets Other Than Nasdaq      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Discount rate 20.00%    
Number of day volume-weighted average closing price | D 30    
Greenbrook TMS Inc | Secured Overnight Financing Rate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Interest rate (as a percent) 7.65%    
Success TMS | Other income, net      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Interest income recognized   $ 0.2 $ 0.0