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Leases - Summary Of Supplemental Cash Flow And Other Information Related To Operating Leases (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Leases [Abstract]
Cash payments (receipts) included in the measurement of operating lease liabilities, net of lease incentives	$ 1,940	$ (835)	$ 3,483	$ (2,932)

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- Definition

Cash payments (proceeds) included in measurement of operating lease liabilities.

+ References

No definition available.

+ Details

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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