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Summary of Significant Accounting Policies - Schedule of Excess and Obsolescence Reserve (Details) - Excess and Obsolescence [Member] - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Excess And Obsolescence Reserve [Line Items] |  |
Beginning balance | $ 65 | $ 0
Provisions | 1,331 | 65
Recoveries | (55) | 0
Ending balance | $ 1,341 | $ 65

X
- Definition Excess and obsolescence reserve. + References No definition available. + Details
Name: | ionq_ExcessAndObsolescenceReserve
Namespace Prefix: | ionq_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Excess and obsolescence reserve. + References No definition available. + Details
Name: | ionq_ExcessAndObsolescenceReserveLineItems
Namespace Prefix: | ionq_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Excess and obsolescence reserve, provisions. + References No definition available. + Details
Name: | ionq_ExcessAndObsolescenceReserveProvisions
Namespace Prefix: | ionq_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Excess and obsolescence reserve, recoveries. + References No definition available. + Details
Name: | ionq_ExcessAndObsolescenceReserveRecoveries
Namespace Prefix: | ionq_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_ChangeInAccountingEstimateByTypeAxis=us-gaap_InventoryValuationAndObsolescenceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |