v3.26.1
STOCKHOLDERS' EQUITY - Preferred stock (Details) - $ / shares
 3 Months Ended 12 Months Ended
Mar. 31, 2026
Dec. 31, 2025
Dec. 31, 2024
STOCKHOLDERS' EQUITY      
Preferred stock, par value (in dollars per share) $ 0.0001 $ 0.0001 $ 0.0001
Preferred stock, shares authorized 74,382,714 74,382,714 74,382,714
Preferred stock, shares issued 65,937,090 64,322,487 64,322,487
Preferred stock, shares outstanding 65,937,090 64,322,487 64,322,487
Series A-1 Preferred Stock      
STOCKHOLDERS' EQUITY      
Preferred stock, shares authorized 3,778,798 3,778,798  
Preferred stock, shares issued 3,778,798 3,778,798 3,778,798
Preferred stock, shares outstanding 3,778,798 3,778,798 3,778,798
Series A-2 Preferred Stock      
STOCKHOLDERS' EQUITY      
Preferred stock, shares authorized 545,372 545,372  
Preferred stock, shares issued 545,372 545,372 545,372
Preferred stock, shares outstanding 545,372 545,372 545,372
Series A-3 Preferred Stock      
STOCKHOLDERS' EQUITY      
Preferred stock, shares authorized 2,423,708 2,423,708  
Preferred stock, shares issued 2,423,708 2,423,708 2,423,708
Preferred stock, shares outstanding 2,423,708 2,423,708 2,423,708
Series A-4 Preferred Stock      
STOCKHOLDERS' EQUITY      
Preferred stock, shares authorized 17,303,891 17,303,891  
Preferred stock, shares issued 17,035,717 15,421,114 15,421,114
Preferred stock, shares outstanding 17,035,717 15,421,114 15,421,114
Series B-1 Preferred Stock      
STOCKHOLDERS' EQUITY      
Preferred stock, shares authorized 18,530,110 18,530,110  
Preferred stock, shares issued 18,530,110 18,530,110 18,530,110
Preferred stock, shares outstanding 18,530,110 18,530,110 18,530,110
Series B-1 Preferred Stock      
STOCKHOLDERS' EQUITY      
Preferred stock, shares authorized 31,800,835 31,800,835  
Preferred stock, shares issued 23,623,385 23,623,385 23,623,385
Preferred stock, shares outstanding 23,623,385 23,623,385 23,623,385
Preferred Stock      
STOCKHOLDERS' EQUITY      
Preferred stock, par value (in dollars per share) $ 0.0001 $ 0.0001 $ 0.0001
Issuance of preferred stock, net of offering costs (in shares) 1,614,603 0 4,542,885
Preferred Stock | Series B Preferred      
STOCKHOLDERS' EQUITY      
Issuance of preferred stock, net of offering costs (in shares)   181,715