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Revenue - Recognized revenue from the major sources (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Disaggregation of Revenue [Line Items]
Revenue	$ 1,314	$ 229	$ 1,993	$ 6,991
Contract liability	2,810		2,810		$ 2,783
Software licensing
Disaggregation of Revenue [Line Items]
Revenue	0	9	400	6,711
Data processing services
Disaggregation of Revenue [Line Items]
Revenue	42	220	321	280
Renewable energy storage systems
Disaggregation of Revenue [Line Items]
Revenue	$ 1,272	$ 0	$ 1,272	$ 0

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