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Summary of Significant Accounting Policies - Schedule of Earnings Per Share, Basic and Diluted (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Numerator:        
Net loss $ (1,055,612) $ (52,496) $ (1,265,394) $ (129,649)
Less: Net loss attributable to noncontrolling interests 657 0 1,349 0
Net loss attributable to IonQ, Inc. $ (1,054,955) $ (52,496) $ (1,264,045) $ (129,649)
Denominator:        
Weighted average shares used in computing net loss per share attributable to IonQ, Inc. common stockholders - Basic 294,524,786 214,305,053 258,324,714 211,378,045
Net loss per share attributable to IonQ, Inc. common stockholders - Basic $ (3.58) $ (0.24) $ (4.89) $ (0.61)
Weighted average shares used in computing net loss per share attributable to IonQ, Inc. common stockholders - Diluted 294,524,786 214,305,053 258,324,714 211,378,045
Net loss per share attributable to IonQ, Inc. common stockholders - Diluted $ (3.58) $ (0.24) $ (4.89) $ (0.61)