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Warrant Transaction Agreement - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	Dec. 31, 2024	Aug. 31, 2020	Nov. 30, 2019
Warrant Transaction Agreement [Abstract]
Class of warrant or right, number of securities called by warrants or rights	8,301,202
Class of warrant or right, exercise price of warrants or rights	$ 1.38
Fair value of the warrant shares			$ 8.7
Class of warrants or rights vested and execisable	0	543,152
Remaining Unvested Warrant Shares	7,758,050

X

- Definition

Class of warrants or rights vested and exercisable.

+ References

No definition available.

+ Details

Name:	ionq_ClassOfWarrantsOrRightsVestedAndExercisable
Namespace Prefix:	ionq_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Fair value of the warrant shares.

+ References

No definition available.

+ Details

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

X

- Definition

Remaining uvested warrant shares.

+ References

No definition available.

+ Details

Name:	ionq_RemainingUnvestedWarrantShares
Namespace Prefix:	ionq_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Warrant transaction agreement.

+ References

No definition available.

+ Details

Name:	ionq_WarrantTransactionAgreementAbstract
Namespace Prefix:	ionq_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-3

+ Details

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

X

- Definition

Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-3

+ Details

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