v3.26.1
EMPLOYEE BENEFIT PLANS (Details) - shares
shares in Thousands
1 Months Ended 12 Months Ended
Jul. 31, 2018
Dec. 31, 2025
Dec. 31, 2024
Defined Benefit Plan Disclosure [Line Items]      
Defined contribution plan, plan name   401(k) plan  
Defined contribution plan, employer contribution percentage of employee salary   3.00%  
Shares available for sale under employee stock purchase plan      
Defined Benefit Plan Disclosure [Line Items]      
Shares of common stock reserved for issuance 200 2,181 1,624
Common stock purchase price, discount rate 15.00%    
Maximum | Shares available for sale under employee stock purchase plan      
Defined Benefit Plan Disclosure [Line Items]      
Period of automatic annual increase in the share reserve 10 years    
401(k) Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined contribution plan, maximum employee contribution deferred percentage   100.00%  
401(k) Plan | Greenbrook      
Defined Benefit Plan Disclosure [Line Items]      
Defined contribution plan, maximum employee contribution deferred percentage   100.00%  
Employees eligible to participate, waiting period   60 days  
Defined contribution plan, vesting period   2 years  
401(k) Plan | Greenbrook | First 1% of wages      
Defined Benefit Plan Disclosure [Line Items]      
Defined contribution plan, employer contribution percentage of employee salary   1.00%  
Defined contribution plan, employer matching percentage   100.00%  
401(k) Plan | Greenbrook | Wages between 1% and 6%      
Defined Benefit Plan Disclosure [Line Items]      
Defined contribution plan, employer matching percentage   50.00%  
401(k) Plan | Maximum | Greenbrook      
Defined Benefit Plan Disclosure [Line Items]      
Defined contribution plan, employer contribution percentage of employee salary   3.50%  
401(k) Plan | Maximum | Greenbrook | Wages between 1% and 6%      
Defined Benefit Plan Disclosure [Line Items]      
Defined contribution plan, employer contribution percentage of employee salary   6.00%  
401(k) Plan | Minimum | Greenbrook | Wages between 1% and 6%      
Defined Benefit Plan Disclosure [Line Items]      
Defined contribution plan, employer contribution percentage of employee salary   1.00%