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Revenue recognition - Disaggregation of revenue (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Revenue $ 7,700 $ 4,130
Charging Revenue Retail [Member]    
Revenue 3,502 1,803
Charging Revenue OEM [Member]    
Revenue 151 332
Charging Revenue Commercial [Member]    
Revenue 709 491
Network Revenue, OEM [Member]    
Revenue 490 532
Ancillary Revenue [Member]    
Revenue 1,470 403
Regulatory Credit Sales [Member]    
Revenue $ 1,378 $ 569