Stockholders' Equity - Narrative (Details)				12 Months Ended
	Jan. 01, 2023 shares	Sep. 27, 2022 USD ($) shares	Sep. 14, 2022 day $ / shares shares	Dec. 31, 2022 USD ($) $ / shares shares	Dec. 31, 2021 USD ($) $ / shares shares	Mar. 01, 2022 $ / shares
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Shares authorized (in shares) | shares			1,000,000,000	1,000,000,000
Common stock, authorized (in shares) | 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) | 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
Unrecognized compensation cost				$ 8,600,000
Award vesting period (in years)				4 years
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
Costs related to issuance of initial commitment shares				$ 326,000	$ 0
BRPC II | Common Stock Purchase Agreement
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Common stock, purchase agreement, potential maximum consideration		$ 200,000,000
Discount on sale of stock (percentage)		3.00%
Maximum shares available for sale as a percentage of aggregate shares issued and outstanding (percentage)		19.99%
Number of shares issued in transaction (in shares) | shares		84,793
Costs related to issuance of initial commitment shares		$ 600,000
PIPE warrants
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Exercise price (in dollars per share) | $ / shares				$ 12.50
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
Public warrants
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Exercise price (in dollars per share) | $ / shares				$ 11.50
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
RSUs
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Weighted average period (in years)				4 years
Unrecognized compensation cost				$ 1,900,000
Award vesting period (in years)				4 years
Options
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Weighted average period (in years)				3 years 1 month 6 days
2022 Plan
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Shares available for future issuance (in shares) | shares			9,900,000	9,722,507
2022 Plan | Subsequent event
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Number of additional shares available for issuance (in shares) | shares	30,000,000
Common shares outstanding, (as per percent)	5.00%
2022 Plan | Maximum
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Number of additional shares available for issuance (in shares) | shares				15,000,000
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
Average intrinsic value				$ 1,200,000	54,000
Fair value of options vested				$ 2,200,000	900,000
Equity Incentive Plans | Stock options
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Award vesting period (in years)				4 years
Amprius Holdings Equity Incentive Plan
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Fair value of options vested				$ 424,000	$ 273,000
Dividend yield					0.00%
Expected volatility					52.20%
Expected term (in years)					5 years
Risk-free rate					1.20%
Weighted average grant date fair value (in dollars per share) | $ / shares					$ 2.50
Vested and exercisable					$ 28,000
Amprius Holdings Equity Incentive Plan | Options
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Unrecognized compensation cost				$ 16,000
Weighted average period (in years)				1 year 3 months 18 days
Awards expiration from date of grant (in years)				10 years
Award expiration period from termination (in days)				90 days
Dividend yield				0.00%	0.00%
Expected volatility				59.20%	51.80%
Expected term (in years)				6 years 2 months 12 days	5 years 10 months 24 days
Risk-free rate				2.70%	1.10%
Amprius Holdings Equity Incentive Plan | Minimum | Options
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Award vesting period (in years)				2 years
Amprius Holdings Equity Incentive Plan | Maximum | Options
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]
Shares reserved for issuance (in shares) | shares			990,000
Purchase price per share as a percentage of fair market value (percentage)				85.00%
Employee Stock Purchase Plan | Maximum | Stock options
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) | shares				0