Revenue Recognition - Disaggregation of revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Revenue	$ 10,509	$ 6,181	$ 27,285	$ 15,095
Charging Revenue Retail [Member]
Revenue	5,176	3,203	13,067	7,505
Charging Revenue OEM [Member]
Revenue	252	151	592	633
Charging Revenue Commercial [Member]
Revenue	678	688	2,041	1,725
Network Revenue, OEM [Member]
Revenue	448	351	1,825	1,158
Ancillary Revenue [Member]
Revenue	2,777	1,104	5,076	2,147
Regulatory Credit Sales [Member]
Revenue	$ 1,178	$ 684	$ 4,684	$ 1,927