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v3.25.3

Stock-Based Compensation - Summary of Restricted Stock Unit ("RSU") and Restricted Stock Activity (Parenthetical) (Detail) $ in Millions | 9 Months Ended
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Sep. 30, 2025 USD ($)
Share-Based Payment Arrangement [Abstract] |
Fair value of conversion of restricted stock in connection with acquisition | $ 48.1

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- Definition Fair value of conversion of restricted stock in connection with acquisition. + References No definition available. + Details
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Namespace Prefix: | ionq_
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Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
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Balance Type: | na
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