v3.26.1
Summary of Significant Accounting Policies - Foreign Operations (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Summary of Significant Accounting Policies    
Assets $ 12,190 $ 12,181
ClearSign Asia Limited    
Summary of Significant Accounting Policies    
Assets 118 $ 175
Registered capital requirement 350  
Capital requirement paid $ 261