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Disaggregation of revenue (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue $ 69,731 $ 102,368
Products transferred at a point in time    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 59,734 78,769
Products and services transferred over time    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 9,997 23,599
Bus    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 44,163 29,265
Truck    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 3,714 10,961
Rail    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 2,647 19,100
Marine    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 2,866 7,331
HD Mobility subtotal    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 53,390 66,657
Stationary    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 12,757 21,707
Emerging Markets and Other    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 3,584 14,004
Europe    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 47,153 48,958
North America    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 17,997 37,736
China    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue 2,631 11,980
Rest of World    
Disclosure of disaggregation of revenue from contracts with customers [line items]    
Revenue $ 1,950 $ 3,694