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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

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