Property and equipment, net (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 25,729		$ 25,729		$ 25,405
Less: Accumulated depreciation	(23,850)		(23,850)		(23,111)
Total Property and equipment, net	1,879		1,879		2,294
Depreciation expense	200	$ 300	700	$ 1,000
North America
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	10,400		10,400		11,400
Quantum computer systems
Property, Plant and Equipment [Line Items]
Total property and equipment	13,711		13,711		13,714
Lab equipment
Property, Plant and Equipment [Line Items]
Total property and equipment	6,838		6,838		6,666
Computer equipment
Property, Plant and Equipment [Line Items]
Total property and equipment	3,614		3,614		3,545
Leasehold improvements
Property, Plant and Equipment [Line Items]
Total property and equipment	1,075		1,075		1,075
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Total property and equipment	372		372		319
Construction-in-progress
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 119		$ 119		$ 86