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Business Combination - Additional Information (Detail)
$ / shares in Units, $ in Millions
 12 Months Ended
Sep. 14, 2022
USD ($)
$ / shares
shares
Dec. 31, 2022
USD ($)
$ / shares
shares
Dec. 31, 2021
$ / shares
shares
Business Acquisition [Line Items]      
Common stock, shares authorized 950,000,000 950,000,000 950,000,000
Common stock, par or stated value per share | $ / shares $ 0.0001 $ 0.0001 $ 0.0001
Preferred stock shares authorized 50,000,000 50,000,000 50,000,000
Preferred stock par or stated value per share | $ / shares $ 0.0001 $ 0.0001 $ 0.0001
Common Stock, Shares, Outstanding   84,610,114 65,772,001
Shares Authorized 1,000,000,000 1,000,000,000  
Recapitalization exchange ratio 1.4559    
Common stock - Legacy Amprius (in shares) 65,776,550    
Options outstanding (in shares) 14,223,410    
Shares subject to vesting obligations (in shares) 6,664,919    
Issuance of common stock in connection with a stock purchase agreement (in shares) 2,052,500    
Sale of stock, price (in dollars per share) | $ / shares $ 10    
Number of common shares per PIPE unit (in shares) 1    
Number of warrants per PIPE unit (in shares) 1    
Proceeds from reverse recapitalization transaction | $ $ 70.9    
Transaction costs paid | $   $ 6.9  
PIPE Investors [Member]      
Business Acquisition [Line Items]      
Common Stock, Shares, Outstanding 84,168,916    
PIPE Units [Member]      
Business Acquisition [Line Items]      
Exercise price of warrant | $ / shares $ 12.5 $ 12.5  
Average price per share of redeemable warrants (in dollars per share) | $ / shares $ 20