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Revenue from contracts with customers - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Disaggregation of Revenue [Line Items]        
Total revenue, net $ 1,707 $ 1,371 $ 3,290 $ 3,083
United States        
Disaggregation of Revenue [Line Items]        
Total revenue, net 485 655 731 1,439
Japan        
Disaggregation of Revenue [Line Items]        
Total revenue, net 263 282 621 709
Germany        
Disaggregation of Revenue [Line Items]        
Total revenue, net 284 257 578 520
Switzerland        
Disaggregation of Revenue [Line Items]        
Total revenue, net 274 0 375 0
United Kingdom        
Disaggregation of Revenue [Line Items]        
Total revenue, net 170 0 401 0
Other        
Disaggregation of Revenue [Line Items]        
Total revenue, net 231 177 584 415
Revenue recognized over the time        
Disaggregation of Revenue [Line Items]        
Total revenue, net 1,665 1,296 3,207 2,957
Revenue recognized at a point in time        
Disaggregation of Revenue [Line Items]        
Total revenue, net 42 75 83 126
QCaaS        
Disaggregation of Revenue [Line Items]        
Total revenue, net 1,032 1,176 2,201 2,560
Professional services        
Disaggregation of Revenue [Line Items]        
Total revenue, net 655 156 1,061 464
Other revenue        
Disaggregation of Revenue [Line Items]        
Total revenue, net $ 20 $ 39 $ 28 $ 59