Quarterly report [Sections 13 or 15(d)]

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Major Vendor (Details)

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Major Vendor (Details) - Vendors - item
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Research and development expenditures | Supplier Concentration Risk          
Concentration          
Number of major vendors 1 3 3 3  
Concentration Risk (as a percent) 57.00% 40.00% 55.00% 44.00%  
Accounts payable and accrued expense | Lender Concentration Risk [Member]          
Concentration          
Concentration Risk (as a percent)     12.00%   6.00%