v3.26.1
INCOME TAX - Tax rate to provision reconciliation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Amount      
Pretax loss $ (77,611) $ (36,138) $ (31,623)
Federal statutory tax rate (16,298)    
State and Local taxes $ (136)    
Effective Income Tax Rate Reconciliation, State and Local Jurisdiction, Contribution Greater than 50 Percent, Tax Effect [Extensible Enumeration] stpr:CA    
Tax incentive $ (1,808)    
Non-deductible expenses 74    
Total Income Tax Expense $ 0 6 9
Tax Jurisdiction of Domicile [Extensible Enumeration] United States    
Reserve for uncertain tax positions $ 0 $ 0 $ 0
Percentage      
Federal statutory tax rate 21.00% 21.00% 21.00%
Effect of tax rates in foreign jurisdiction   (6.15%) (5.80%)
State income tax rate 0.18% 0.11% 0.05%
Effect of preferential tax rate   (0.06%) (0.07%)
Statutory tax rate difference   0.02% 0.03%
Changes in valuation allowances   (13.50%) (11.99%)
Research and development credit 2.33% (0.98%) (2.94%)
Non-deductible expenses (0.10%) (0.42%) (0.25%)
Effective tax rate 0.00% 0.02% 0.03%
United States      
Amount      
Change in valuation allowance $ 2,849    
Percentage      
Changes in valuation allowances (3.67%)    
Cayman Islands      
Amount      
Statutory tax rate difference $ 7,012    
Percentage      
Statutory tax rate difference (9.03%)    
Hong Kong      
Amount      
Statutory tax rate difference $ 1,623    
Change in valuation allowance $ 5,851    
Percentage      
Statutory tax rate difference (2.09%)    
Changes in valuation allowances (7.54%)    
Other      
Amount      
Statutory tax rate difference $ 47    
Change in valuation allowance 851    
Other $ (65)    
Percentage      
Statutory tax rate difference (0.06%)    
Changes in valuation allowances (1.10%)    
Other 0.08%