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Forward Warrant Agreement - Additional Information (Detail) - Forward Warrant Agreement [Member] - USD ($)
$ / shares in Units, $ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2022
Jun. 30, 2022
Dec. 31, 2021
Jun. 30, 2021
Rigetti [Member]        
Class of Warrant or Right [Line Items]        
Derivative liabilities $ 0.2 $ 0.2    
Derivative asset 1.5 1.5    
Ampere        
Class of Warrant or Right [Line Items]        
Business combination consideration to be paid $ 5.0      
Share based compensation arrangement share based payment award options vested and exercisable       500,000
Ampere | Rigetti [Member]        
Class of Warrant or Right [Line Items]        
Proceeds from Issuance of Warrants   $ 10.0    
Stock issued during period number of warrants issued   1,000,000    
Exercise price of warrants $ 0.0001 $ 0.0001    
Ampere | Rigetti [Member] | Share-based Payment Arrangement, Tranche One [Member]        
Class of Warrant or Right [Line Items]        
Business combination consideration to be paid $ 5.0   $ 5.0  
Share based compensation arrangement share based payment award options vested and exercisable 500,000 500,000    
Ampere | Rigetti [Member] | Share-based Payment Arrangement, Tranche Two [Member]        
Class of Warrant or Right [Line Items]        
Business combination consideration to be paid $ 5.0      
Share based compensation arrangement share based payment award options vested and exercisable 500,000 500,000