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Revenue Recognition - Summary of Disaggregation of Revenue (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Disaggregation of Revenue [Line Items]        
Revenue $ 2,378 $ 3,105 $ 8,516 $ 8,632
Revenue recognized at a point in time        
Disaggregation of Revenue [Line Items]        
Revenue   412 523 748
Revenue recognized over time        
Disaggregation of Revenue [Line Items]        
Revenue 2,378 2,693 7,993 7,884
Collaborative research, other professional services and related materials        
Disaggregation of Revenue [Line Items]        
Revenue 2,306 2,266 8,224 6,560
Access to quantum computing systems        
Disaggregation of Revenue [Line Items]        
Revenue $ 72 $ 839 $ 292 $ 2,072