v3.26.3
Stock-Based Compensation - Schedule of Stock Options Valuation Assumptions (Details)
6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
SEALSQ Corp One [Member]    
Class of Stock [Line Items]    
Dividend yield
Risk-free interest rate used (average) 1.00% 1.00%
Expected market price volatility 175.40%  
Expected market price volatility (Minimum) 172.11%  
Expected market price volatility (Maximum) 179.04%  
SEALSQ Corp One [Member] | Ordinary Shares [Member]    
Class of Stock [Line Items]    
Average remaining expected life of stock options on WIHN 6 years 1 month 6 days 6 years 4 months 24 days
WISeKey SA | Related Party [Member]    
Class of Stock [Line Items]    
Dividend yield
Risk-free interest rate used (average) 1.00% 1.00%
Expected market price volatility 118.90%  
Expected market price volatility (Minimum)   83.07%
Expected market price volatility (Maximum)   127.81%
Class B Common Stock [Member] | WISeKey SA | Related Party [Member]    
Class of Stock [Line Items]    
Average remaining expected life of stock options on WIHN 3 years 3 months 10 days 3 years 5 months 26 days
Class A Common Stock [Member] | WISeKey SA | Related Party [Member]    
Class of Stock [Line Items]    
Average remaining expected life of stock options on WIHN 3 years 4 months 24 days
Class F Common Stock [Member] | SEALSQ Corp One [Member]    
Class of Stock [Line Items]    
Average remaining expected life of stock options on WIHN