v3.26.1
INCOME TAXES - Effective tax reconciliation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract]    
U.S. federal statutory tax rate $ (15,507)  
Foreign rate differential (45)  
Changes in valuation allowance 12,608  
Change in fair value of convertible promissory notes 1,866  
Other nontaxable or nondeductible items 746  
Other adjustments 332  
Effective Tax Rate $ 0 $ 0
Tax Jurisdiction of Domicile [Extensible Enumeration] UNITED STATES  
Effective Income Tax Rate Reconciliation, Percent [Abstract]    
U.S. federal statutory tax rate 21.00% 21.00%
Foreign rate differential 0.05% (1.00%)
Changes in valuation allowance (17.00%) (19.00%)
Change in fair value of convertible promissory notes (2.50%)  
Other nontaxable or nondeductible items (1.00%)  
Other adjustments (0.55%)  
Stock-based compensation   (1.00%)