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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
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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 |  |

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- Definition Class of warrants or rights vested and exercisable. + References No definition available. + Details
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Namespace Prefix: | ionq_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- 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

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- 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

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- 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

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- 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

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- 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