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Fair Value Measurements - Change in Fair Value of Derivative Liabilities (Details) - Fair Value, Inputs, Level 3 - USD ($)
3 Months Ended 12 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Jan. 31, 2021
Jan. 31, 2020
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]          
Derivative liabilities, beginning balance $ 5,340,000 $ 13,728,750    
Transfer of Public Warrants to Level 1 Measurement   (9,056,250)      
Change in fair value of derivative liabilities - Level 3 (1,780,000) 667,500 523,000    
Derivative liabilities, ending balance- Level 3 $ 3,560,000 $ 5,340,000 13,728,750    
Public Warrants          
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]          
Issuance of Public Warrants - Level 3     8,711,250    
Private Placement Warrants          
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]          
Issuance of Public Warrants - Level 3     $ 4,494,500    
Rigetti Holdings [Member] | Convertible Notes [Member]          
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]          
Derivative liabilities, beginning balance       $ 26,892,459 $ 1,751,342
Issuance of Public Warrants - Level 3       0 19,950,000
Settlement       (26,892,459) 0
Change in fair value of derivative liabilities - Level 3       0 5,191,117
Derivative liabilities, ending balance- Level 3       0 26,892,459
Rigetti Holdings [Member] | Simple Agreement For Future Equity [Member]          
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]          
Derivative liabilities, beginning balance       1,882,397 0
Issuance of Public Warrants - Level 3       0 1,500,000
Settlement       (1,882,397) 0
Change in fair value of derivative liabilities - Level 3       0 382,397
Derivative liabilities, ending balance- Level 3       0 1,882,397
Rigetti Holdings [Member] | Redeemable Convertible Preferred Stock Warrant Liability [Member]          
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]          
Derivative liabilities, beginning balance       0 122,000
Issuance of Public Warrants - Level 3       0 0
Settlement       0 (122,000)
Change in fair value of derivative liabilities - Level 3       0 0
Derivative liabilities, ending balance- Level 3       $ 0 $ 0