Class of warrants and rights issued during the period.

No definition available.

Name:	ampx_ClassOfWarrantsAndRightsIssuedDuringThePeriod
Namespace Prefix:	ampx_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Class of warrants and rights issued price per warrant.

+ References

No definition available.

+ Details

Name:	ampx_ClassOfWarrantsAndRightsIssuedPricePerWarrant
Namespace Prefix:	ampx_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Common stock and preferred stock shares authorized.

+ References

No definition available.

+ Details

Name:	ampx_CommonStockAndPreferredStockSharesAuthorized
Namespace Prefix:	ampx_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Proceeds from issuance of stock in connection with business combination.

+ References

No definition available.

+ Details

Name:	ampx_ProceedsFromIssuanceOfStockInConnectionWithBusinessCombination
Namespace Prefix:	ampx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of direct costs of the business combination including legal, accounting, and other costs incurred to consummate the business acquisition.

+ References

No definition available.

+ Details

Name:	us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_BusinessAcquisitionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI https://asc.fasb.org/extlink&oid=126973232&loc=d3e21475-112644

+ Details

Name:	us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of securities into which each warrant or right may be converted. For example, but not limited to, each warrant may be converted into two shares.

+ References

No definition available.

+ Details

Name:	us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Face amount or stated value per share of common stock.

+ References

+ Details

Name:	us-gaap_CommonStockParOrStatedValuePerShare
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

+ References

+ Details

Name:	us-gaap_CommonStockSharesAuthorized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(28))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496158-112644

+ Details

Name:	us-gaap_PreferredStockParOrStatedValuePerShare
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.

+ References

+ Details

Name:	us-gaap_PreferredStockSharesAuthorized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of shares issued under share-based payment arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Price of a single share of a number of saleable stocks of a company.

+ References

No definition available.

+ Details

Name:	us-gaap_SharePrice
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of options vested.

+ References

No definition available.

+ Details

Name:	us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedNumberOfShares
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of shares issued which are neither cancelled nor held in the treasury.

+ References

No definition available.

+ Details

Name:	us-gaap_SharesOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SAB TOPIC 4.C)
-URI https://asc.fasb.org/extlink&oid=120397183&loc=d3e187143-122770

+ Details

Name:	us-gaap_StockholdersEquityNoteStockSplitConversionRatio1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=ampx_PipeUnitsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=ampx_LegacyAmpriusOptionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementEquityComponentsAxis=us-gaap_CommonStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ampx_ShareRedemptionTriggerPriceAxis=ampx_SharePriceEqualOrExceedsTwentyDollarPerShareMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=ampx_LegacyAmpriusMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Business Combination - Additional Information (Detail) $ / shares in Units, $ in Thousands		9 Months Ended
	Sep. 14, 2022 $ / shares shares	Sep. 30, 2022 USD ($) $ / shares shares	Jul. 01, 2022 shares	Dec. 31, 2021 $ / shares shares	Sep. 30, 2021 shares	Dec. 31, 2020 $ / shares shares	Dec. 31, 2019 shares
Business Acquisition [Line Items]
Common Stock and Preferred Stock Shares Authorized	1,000,000	1,000,000,000
Common stock, shares authorized	950,000	950,000		950,000,000		950,000,000
Common stock, par or stated value per share \| $ / shares	$ 0.0001	$ 0.0001		$ 0.0001		$ 0.0001
Preferred stock shares authorized	50,000	50,000,000
Preferred stock par or stated value per share \| $ / shares	$ 0.0001	$ 0.0001
Proceeds from issuance of stock in connection with business combination \| $		$ 70,938
Stockholders' Equity Note, Stock Split, Conversion Ratio		1.4559
Business acquisition, transaction costs \| $		$ 6,794
PIPE units [Member]
Business Acquisition [Line Items]
Class of warrants and rights issued during the period	2,052	2,052,000
Class of warrants and rights issued, price per warrant \| $ / shares	$ 10	$ 10
Number of securities into which each warrant or right may be converted	1
Class of Warrant or Right, Exercise Price of Warrants or Rights \| $ / shares	$ 12.5	$ 12.5
Legacy Amprius Option [Member]
Business Acquisition [Line Items]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested, Number of Shares	6,665
Stockholders' Equity Note, Stock Split, Conversion Ratio	1.4559
Common Stock [Member]
Business Acquisition [Line Items]
Shares, Outstanding		84,254		65,772,001	65,772,000	65,742,883	65,670,088
Common Stock [Member] \| PIPE units [Member] \| Share Price Equal Or Exceeds Twenty Dollar Per Share [Member]
Business Acquisition [Line Items]
Share price \| $ / shares	$ 20	$ 20
Common Stock [Member] \| Legacy Amprius Option [Member]
Business Acquisition [Line Items]
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period	14,223
Legacy Amprius [Member] \| Common Stock [Member]
Business Acquisition [Line Items]
Shares, Outstanding			65,777