v3.26.3
Earnings / (Loss) Per Share - Schedule of Earnings Per Shares, Basic and Diluted (Details) - USD ($)
$ / shares in Units, $ in Thousands
 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Schedule of Earnings Per Shares, Basic and Diluted [Line Items]    
Net loss attributable to SEALSQ Corp (USD’000) (in Dollars) $ (27,712) $ (20,030)
Effect of potentially dilutive instruments on net earnings (in Dollars)
Net loss after effect of potentially dilutive instruments attributable to SEALSQ Corp (in Dollars) $ (27,712) $ (20,030)
Effect of potentially dilutive equivalent shares
Ordinary Shares [Member]    
Schedule of Earnings Per Shares, Basic and Diluted [Line Items]    
Weighted average shares outstanding - basic 209,809,568 108,980,395
Weighted average shares outstanding - diluted 209,809,568 108,980,395
Basic weighted average loss per share attributable to SEALSQ Corp (in Dollars per share) $ (0.13) $ (0.17)
Diluted weighted average loss per share attributable to SEALSQ Corp (in Dollars per share) $ (0.13) $ (0.17)
F Shares [Member]    
Schedule of Earnings Per Shares, Basic and Diluted [Line Items]    
Weighted average shares outstanding - basic 1,499,800 1,499,800
Weighted average shares outstanding - diluted 1,499,800 1,499,800
Basic weighted average loss per share attributable to SEALSQ Corp (in Dollars per share) $ (0.64) $ (0.86)
Diluted weighted average loss per share attributable to SEALSQ Corp (in Dollars per share) $ (0.64) $ (0.86)