Business Combination - Narrative (Details) $ / shares in Units, $ in Millions		12 Months Ended
	Sep. 14, 2022 USD ($) day $ / shares shares	Dec. 31, 2022 USD ($) $ / shares shares	Mar. 01, 2022 $ / shares	Dec. 31, 2021 $ / shares shares
Business Combination and Asset Acquisition [Abstract]
Shares authorized (in shares)	1,000,000,000	1,000,000,000
Common stock, authorized (in shares)	950,000,000	950,000,000		950,000,000
Common stock, par value (in dollars per share) | $ / shares	$ 0.0001	$ 0.0001		$ 0.0001
Preferred stock, shares authorized (in shares)	50,000,000	50,000,000		50,000,000
Preferred stock, par value (in dollars per share) | $ / shares	$ 0.0001	$ 0.0001		$ 0.0001
Recapitalization exchange ratio	1.45590
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
Common stock - PIPE Investors (in shares)	2,052,500
Sale of stock, price (in dollars per share) | $ / shares	$ 10.00
Number of common shares per PIPE unit (in shares)	1
Number of warrants per PIPE unit (in shares)	1
Exercise price (in dollars per share) | $ / shares	$ 12.50		$ 11.50
Average price per share of redeemable warrants (in dollars per share) | $ / shares	$ 20.00
Warrants, redeem, threshold trading days | day	20
Warrants, redeem, threshold consecutive trading days | day	30
Business combination PIPE totaling (in shares)	84,168,916
Proceeds from reverse recapitalization transaction | $	$ 70.9
Transaction costs paid | $		$ 6.9