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Revenue Recognition - Disaggregation of revenue (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Revenue $ 25,300 $ 7,700
Charging Revenue Retail [Member]    
Revenue 6,615 3,502
Charging Revenue OEM [Member]    
Revenue 552 151
Charging Revenue Commercial [Member]    
Revenue 1,715 709
Network Revenue OEM [Member]    
Revenue 2,699 490
Ancillary Revenue.    
Revenue 2,212 1,390
Regulatory Credit Sales [Member]    
Revenue 1,215 1,378
eXtend [Member]    
Revenue $ 10,292 $ 80