Name:	ionq_OptionAgreementIndexedToEquitySharesAvailableForIssuanceFairValue
Namespace Prefix:	ionq_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Option agreement, remaining number of shares available for issuance.

+ References

No definition available.

+ Details

Name:	ionq_OptionAgreementRemainingNumberOfSharesAvailableForIssuance
Namespace Prefix:	ionq_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Aggregate number of common shares reserved for future issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

+ Details

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

- Definition

Amount of expense for research and development. Includes, but is not limited to, cost for computer software product to be sold, leased, or otherwise marketed and writeoff of research and development assets acquired in transaction other than business combination or joint venture formation or both. Excludes write-down of intangible asset acquired in business combination or from joint venture formation or both, used in research and development activity.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 48
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482785/280-10-55-48

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 985
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481283/985-20-50-2

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 730
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482916/730-10-50-1

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 912
-SubTopic 730
-Name Accounting Standards Codification
-Section 25
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479532/912-730-25-1

+ Details

Name:	us-gaap_ResearchAndDevelopmentExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Number of shares of stock issued during the period as part of a transaction to acquire assets that do not qualify as a business combination.

+ References

No definition available.

+ Details

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

- Details

Name:	ionq_AgreementAxis=ionq_OptionAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=ionq_UniversityOfMarylandMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=ionq_DukeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=ionq_UniversityOfMarylandAndDukeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_PatentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ionq_DetailsAxis=ionq_InitialPatentsReceivedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ionq_AgreementAxis=ionq_AmendedLicenseAgreementMember
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:	ionq_AgreementAxis=ionq_AmendedOptionAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Agreements With University Of Maryland And Duke University - Additional information (Detail) - USD ($) $ in Thousands		1 Months Ended	12 Months Ended
	Feb. 01, 2021	Jul. 31, 2016	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2020	Dec. 31, 2016
Agreement Disclosure [Line Items]
Common stock, capital shares reserved for future issuance			73,863,844	82,654,698
Research and development expense			$ 136,827	$ 92,321	$ 43,978
Option Agreement [Member]
Agreement Disclosure [Line Items]
Agreement, option to extend			extend another year
Option Agreement [Member] \| University Of Maryland [Member]
Agreement Disclosure [Line Items]
Agreement term							5 years
Common stock, capital shares reserved for future issuance							642,995
Option Agreement [Member] \| Duke [Member]
Agreement Disclosure [Line Items]
Research and development expense			$ 500	$ 500	$ 500
Option Agreement [Member] \| University Of Maryland And Duke [Member] \| Patents [Member] \| Initial Patents Received [Member]
Agreement Disclosure [Line Items]
Stock issued during the period purchase of assets		142,886
Amended License Agreement [Member] \| University Of Maryland [Member]
Agreement Disclosure [Line Items]
Option agreement indexed to equity, shares available for issuance, fair value	$ 1,600
Amended License Agreement [Member] \| University Of Maryland [Member] \| Common Stock [Member]
Agreement Disclosure [Line Items]
Stock issued during the period purchase of assets	257,198
Amended Option Agreement [Member] \| Duke [Member] \| Common Stock [Member]
Agreement Disclosure [Line Items]
Option agreement, remaining number of shares available for issuance						1,214,317