Stockholders' Equity - Narrative (Details) $ / shares in Units, $ in Thousands						3 Months Ended	12 Months Ended		15 Months Ended
	Jun. 24, 2024 USD ($)	May 13, 2024 $ / shares shares	Oct. 02, 2023 USD ($)	Sep. 27, 2022 USD ($) shares	Sep. 14, 2022 day $ / shares	Dec. 31, 2024 USD ($) $ / shares shares	Dec. 31, 2024 USD ($) $ / shares shares	Dec. 31, 2023 USD ($) $ / shares shares	Dec. 31, 2024 USD ($) $ / shares shares	Mar. 01, 2022 $ / shares
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Shares authorized (in shares)						1,000,000,000	1,000,000,000		1,000,000,000
Common stock, authorized (in shares)						950,000,000	950,000,000	950,000,000	950,000,000
Common stock, par value (in dollars per share) | $ / shares						$ 0.0001	$ 0.0001	$ 0.0001	$ 0.0001
Preferred stock, shares authorized (in shares)						50,000,000	50,000,000	50,000,000	50,000,000
Preferred stock, par value (in dollars per share) | $ / shares						$ 0.0001	$ 0.0001	$ 0.0001	$ 0.0001
Number of securities called by each warrant (in shares)						1	1		1
Unrecognized compensation cost | $						$ 2,900	$ 2,900		$ 2,900
Exercise price (in dollars per share) | $ / shares		$ 1.10				$ 1.10	$ 1.10		$ 1.10	$ 11.50
Exercised (in shares)							13,075,664
Proceeds from issuance of common stock upon exercise of stock warrants | $							$ 14,384	$ 1
Stock issuance costs | $							(800)
Increase in fair value of modified stock warrants | $							727	$ 0
Deferred stock issuance cost | $							100
Sales Agreement
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Aggregate offering price | $			$ 100,000
Cumulative proceeds from the sale of shares under the Committed Equity Financing | $							$ 33,400		$ 33,800
Sales Agreement | Common Stock
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
New shares issued (in shares)							14,701,388	89,383
Common Stock Purchase Agreement (“Purchase Agreement) | Common Stock
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
New shares issued (in shares)								2,952,763
BRPC II | Common Stock Purchase Agreement (“Purchase Agreement)
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Common stock, purchase agreement, potential maximum consideration | $				$ 200,000
Number of shares issued in transaction (in shares)				2,952,763
Cumulative proceeds from the sale of shares under the Committed Equity Financing | $				$ 19,100
Discount on sale of stock (percentage)				3.00%
Deferred stock issuance costs | $						$ 600	$ 600		600
Public warrants
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Exercised (in shares)		12,575,664					12,575,664
Average price per share of redeemable warrants (in dollars per share) | $ / shares					$ 18.00
Warrants, redeem, threshold trading days | day					20
Warrants, redeem, threshold consecutive trading days | day					30
PIPE warrants
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Exercise price (in dollars per share) | $ / shares					$ 12.50
Exercised (in shares)							0
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
Private warrants
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Exercised (in shares)		500,000				15,600,000	500,000
New shares issued (in shares)						3,073,200
Increase in fair value of modified stock warrants | $	$ 700
Private warrants | Common Stock
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Conversion ratio, stock warrant into common stock	0.197
Stock options
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Stock options, granted							0
Weighted average period (in years)							1 year 4 months 24 days
RSUs
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Weighted average period (in years)							2 years 10 months 24 days
Fair value of vested RSUs | $							$ 3,900	$ 500
Granted (in dollars per share) | $ / shares							$ 2.39	$ 7.06
Unrecognized compensation cost | $						$ 10,900	$ 10,900		$ 10,900
Granted (in shares)							5,025,472
2022 Plan
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Shares available for future issuance (in shares)						17,716,822	17,716,822		17,716,822
Stock options, granted							0	0
Equity Incentive Plans
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Exercise price as a percentage of fair value							100.00%
Optionee stockholder percentage for option price							10.00%
Exercise price as a percentage of fair value, ten percent stockholders							110.00%
Award expiration period (in years)							10 years
Intrinsic value of options exercised | $							$ 4,200	$ 5,100
Fair value of options vested | $							$ 3,300	$ 2,700
Equity Incentive Plans | Stock options
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Award vesting period (in years)							4 years
Equity Incentive Plans | RSUs
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Award vesting period (in years)							4 years
Employee Stock Purchase Plan | Stock options
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Reserved for issuance (in shares)						2,724,333	2,724,333		2,724,333
Purchase price per share as a percentage of fair market value (percentage)							85.00%
Employee Stock Purchase Plan | Stock options | Maximum
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Purchase period (in months)							27 months
Executive Incentive Compensation Plan
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Granted (in shares)							0
Amprius Holdings Second Equity Incentive Plan | Stock options
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Stock options, granted								0
Estimated grant date, price per share (in dollars per share) | $ / shares							$ 0.34
Expected life							5 years
Expected volatility rate							75.00%
Risk free interest rate							3.60%
Expected dividend yield							0.00%