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INCOME TAXES - 10-K - Narrative (Details) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Income Tax Disclosure [Abstract]              
Income tax provision $ (31,463,000) $ 1,253,000 $ (26,876,000) $ 1,788,000 $ 2,177,000 $ 102,000  
Decrease in deferred tax assets valuation allowance         1,500,000    
Deferred tax assets valuation allowance         69,608,000 71,129,000  
Net operating losses         221,900,000 176,600,000  
Tax credit carryforwards         5,700,000 200,000  
Unrecognized tax benefits         3,045,000 104,000 $ 104,000
Unrecognized tax benefits that would impact the effective tax rate         $ 0 $ 0