v3.26.3
Stock-Based Compensation - Schedule of Stock Option Activity (Details) - USD ($)
 6 Months Ended 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Jun. 30, 2026
Dec. 31, 2025
Ordinary Shares [Member]        
Schedule of Stock Option Activity [Line Items]        
Shares under options, Exercised or converted     (1,588,536)  
Ordinary Shares [Member] | SEALSQ Corp One [Member]        
Schedule of Stock Option Activity [Line Items]        
Outstanding at the beginning of the period     575,024 245,165
Weighted-average exercise price at the beginning of the period     $ 0.04 $ 0.01
Weighted average remaining contractual term (in years) 6 years 1 month 20 days 6 years 7 months 24 days 5 years 4 months 17 days  
Aggregate intrinsic value - outstanding $ 2,152,900 $ 1,505,313,000 $ 648,096 $ 2,152,900
Shares under options, Of which vested 573,824 245,165 209,958 573,824
Weighted-average exercise price, Of which vested $ 0.04 $ 0.01 $ 0.08 $ 0.04
Weighted average remaining contractual term - of which vested (in years) 6 years 1 month 20 days 6 years 7 months 24 days 5 years 4 months 17 days  
Aggregate intrinsic value - Of which vested $ 2,148,376 $ 1,505,313,000 $ 644,328 $ 2,148,376
Shares under options, Of which non-vested 1,200 1,200 1,200
Weighted-average exercise price, Of which non-vested $ 4.29 $ 4.29 $ 4.29
Shares under options, Granted     1,230,670 3,042,652
Weighted-average exercise price, Granted     $ 0.02 $ 0.01
Shares under options, Exercised or converted     (1,588,536) (2,647,019)
Weighted-average exercise price, Exercised or converted     $ 0.01 $ 0.01
Aggregate intrinsic value - exercised or converted     $ 5,203,593,000 $ 9,471,366
Shares under options, Forfeited or cancelled     (6,000) (65,774)
Weighted-average exercise price, Forfeited or cancelled     $ 2.5 $ 0.01
Outstanding at the end of the period 575,024 245,165 211,158 575,024
Weighted-average exercise price at the end of the period $ 0.04 $ 0.01 $ 0.08 $ 0.04
Class B Common Stock [Member]        
Schedule of Stock Option Activity [Line Items]        
Outstanding at the beginning of the period     289,247 276,259
Weighted-average exercise price at the beginning of the period     $ 2.47 $ 2.4
Weighted average remaining contractual term (in years) 4 years 3 months 21 days 5 years 3 months 4 years 29 days  
Aggregate intrinsic value - outstanding $ 4,073,566 $ 5,235,260 $ 2,399,174 $ 4,073,566
Shares under options, Of which vested 289,247 276,123 199,076 289,247
Weighted-average exercise price, Of which vested $ 2.47 $ 2.4 $ 2.54 $ 2.47
Weighted average remaining contractual term - of which vested (in years) 4 years 3 months 21 days 5 years 2 months 26 days 4 years 29 days  
Aggregate intrinsic value - Of which vested $ 4,073,566 $ 5,226,771 $ 2,399,174 $ 4,073,566
Shares under options, Of which non-vested 136
Weighted-average exercise price, Of which non-vested $ 7.55
Shares under options, Granted     4,894 22,129
Weighted-average exercise price, Granted     $ 0.13 $ 0.97
Shares under options, Exercised or converted     (94,844) (7,741)
Weighted-average exercise price, Exercised or converted     $ 2.2 $ 0.13
Aggregate intrinsic value - exercised or converted     $ 1,001,061 $ 127,275
Shares under options, Forfeited or cancelled     (1,200)
Weighted-average exercise price, Forfeited or cancelled     $ 3.16
Shares under options, Expired     (221) (200)
Weighted-average exercise price, Expired    
Outstanding at the end of the period 289,247 276,259 199,076 289,247
Weighted-average exercise price at the end of the period $ 2.47 $ 2.4 $ 2.54 $ 2.47
Class B Common Stock [Member] | Previously Reported [Member]        
Schedule of Stock Option Activity [Line Items]        
Weighted-average exercise price, Of which non-vested      
Class A Common Stock [Member]        
Schedule of Stock Option Activity [Line Items]        
Outstanding at the beginning of the period     392,720 392,720
Weighted-average exercise price at the beginning of the period     $ 0.25 $ 0.25
Weighted average remaining contractual term (in years) 2 years 10 months 24 days 3 years 10 months 24 days 2 years 4 months 28 days  
Aggregate intrinsic value - outstanding $ 526,675 $ 723,175 $ 199,624 $ 526,675
Shares under options, Of which vested 392,720 392,720 174,540 392,720
Weighted-average exercise price, Of which vested $ 0.25 $ 0.25 $ 0.16 $ 0.25
Weighted average remaining contractual term - of which vested (in years) 2 years 10 months 24 days 3 years 10 months 24 days 2 years 4 months 28 days  
Aggregate intrinsic value - Of which vested $ 526,675 $ 723,175 $ 199,624 $ 526,675
Shares under options, Of which non-vested
Weighted-average exercise price, Of which non-vested
Shares under options, Granted    
Weighted-average exercise price, Granted    
Shares under options, Exercised or converted     (218,180)  
Weighted-average exercise price, Exercised or converted     $ 0.32  
Aggregate intrinsic value - exercised or converted     $ 58,546,000  
Outstanding at the end of the period 392,720 392,720 174,540 392,720
Weighted-average exercise price at the end of the period $ 0.25 $ 0.25 $ 0.16 $ 0.25
Class F Common Stock [Member] | SEALSQ Corp One [Member]        
Schedule of Stock Option Activity [Line Items]        
Outstanding at the beginning of the period    
Weighted-average exercise price at the beginning of the period    
Weighted average remaining contractual term (in years)  
Aggregate intrinsic value - outstanding
Shares under options, Of which vested
Weighted-average exercise price, Of which vested
Weighted average remaining contractual term - of which vested (in years)  
Aggregate intrinsic value - Of which vested
Shares under options, Of which non-vested
Weighted-average exercise price, Of which non-vested
Shares under options, Granted    
Weighted-average exercise price, Granted    
Shares under options, Exercised or converted    
Weighted-average exercise price, Exercised or converted    
Aggregate intrinsic value - exercised or converted    
Outstanding at the end of the period
Weighted-average exercise price at the end of the period