v3.26.1
STOCKHOLDERS' EQUITY - Preferred stock (Details)
 3 Months Ended 12 Months Ended
Mar. 31, 2026
$ / shares
shares
Dec. 31, 2025
USD ($)
director
$ / shares
shares
Dec. 31, 2024
$ / shares
shares
STOCKHOLDERS' EQUITY      
Preferred stock, par value (in dollars per share) | $ / shares $ 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
Dividend rate   8.00%  
Conversion ratio   1  
Minimum qualified IPO | $   $ 50  
Series A Preferred      
STOCKHOLDERS' EQUITY      
Number of directors | director   1  
Minimum shares outstanding for director election   321,697  
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
Estimated fair value per share | $ / shares   $ 14.25  
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
Estimated fair value per share | $ / shares   $ 15.25  
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
Estimated fair value per share | $ / shares   $ 16  
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
Estimated fair value per share | $ / shares   $ 19  
Series B Preferred      
STOCKHOLDERS' EQUITY      
Number of directors | director   1  
Minimum shares outstanding for director election   498,429  
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
Estimated fair value per share | $ / shares   $ 20.25  
Series B-2 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
Estimated fair value per share | $ / shares   $ 27.5  
Preferred Stock      
STOCKHOLDERS' EQUITY      
Preferred stock, par value (in dollars per share) | $ / shares $ 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      
Estimated fair value per share | $ / shares   $ 27.5  
Issuance of preferred stock, net of offering costs (in shares)   181,715  
Aggregate gross proceeds | $   $ 5,000,000  
Offering costs | $   $ 39,442