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Leases - Summary Of Supplemental Cash Flow And Other Information Related To Operating Leases (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Leases [Abstract] |  |  |
Cash payments (receipts) included in the measurement of operating lease liabilities, net | $ (2,251) | $ (1,790) | $ 644

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- Definition Cash payments (proceeds) included in measurement of operating lease liabilities. + References No definition available. + Details
Name: | ionq_CashPaymentsProceedsIncludedInMeasurementOfOperatingLeaseLiabilities
Namespace Prefix: | ionq_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_LeasesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration