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Leases - Summary Of Supplemental Cash Flow And Other Information Related To Operating Leases (Detail) - USD ($) $ in Thousands	12 Months Ended
	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