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Segment reporting (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Revenue    
Capital equipment $ 3,150 $ 4,581
Recurring - non-capital 3,723 2,723
Total revenue 6,873 7,304
Canada    
Revenue    
Capital equipment 1,724 4,031
Recurring - non-capital 353 2,454
Total revenue 2,077 6,485
USA    
Revenue    
Recurring - non-capital 2,090  
Total revenue 2,090  
Germany    
Revenue    
Capital equipment 1,426 550
Recurring - non-capital 1,280 269
Total revenue $ 2,706 $ 819