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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29)
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

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

- Definition

The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 912
-SubTopic 730
-Section 25
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=6472174&loc=d3e58812-109433

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 985
-SubTopic 20
-Section 50
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 730
-SubTopic 10
-Section 50
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=6420194&loc=d3e21568-108373

+ 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	3 Months Ended		6 Months Ended		12 Months Ended
	Feb. 01, 2021	Jul. 31, 2016	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2020	Dec. 31, 2016
Agreement Disclosure [Line Items]
Research and development expense			$ 19,869	$ 9,653	$ 36,102	$ 16,990
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			$ 100	$ 100	$ 300	$ 300
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