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Property and equipment, net (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Property, Plant and Equipment [Line Items]    
Total property and equipment $ 25,461 $ 25,405
Less: Accumulated depreciation (23,420) (23,111)
Property and equipment, net 2,041 2,294
Quantum computer systems    
Property, Plant and Equipment [Line Items]    
Total property and equipment 13,712 13,714
Lab equipment    
Property, Plant and Equipment [Line Items]    
Total property and equipment 6,686 6,666
Computer equipment    
Property, Plant and Equipment [Line Items]    
Total property and equipment 3,583 3,545
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Total property and equipment 1,075 1,075
Furniture and fixtures    
Property, Plant and Equipment [Line Items]    
Total property and equipment 319 319
Construction-in-progress    
Property, Plant and Equipment [Line Items]    
Total property and equipment $ 86 $ 86