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Segment reporting - Schedule of Segment Information (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
Segment reporting
Revenue	$ 1,314	$ 229	$ 1,993	$ 6,991
Loss (income) from operations	47,385	29,686	85,974	46,892
Segment Assets	309,761		309,761		$ 260,486
Operating Segments
Segment reporting
Revenue	1,314	229	1,993	6,991
Loss (income) from operations	47,385	29,686	85,974	46,892
Segment Assets	309,761	340,994	309,761	340,994
Operating Segments | Critical Metals
Segment reporting
Revenue	0	0	0	0
Loss (income) from operations	44,648	27,103	80,807	47,883
Segment Assets	293,234	309,574	293,234	309,574
Operating Segments | Data Processing
Segment reporting
Revenue	42	229	721	6,991
Loss (income) from operations	746	953	1,145	(4,596)
Segment Assets	4,253	7,259	4,253	7,259
Operating Segments | Energy Storage
Segment reporting
Revenue	1,272	0	1,272	0
Loss (income) from operations	1,991	1,630	4,022	3,605
Segment Assets	12,274	24,161	12,274	24,161
Intersegment Eliminations
Segment reporting
Revenue	15	96	63	139
Intersegment Eliminations | Critical Metals
Segment reporting
Revenue	0	0	0	0
Intersegment Eliminations | Data Processing
Segment reporting
Revenue	15	96	63	139
Intersegment Eliminations | Energy Storage
Segment reporting
Revenue	$ 0	$ 0	$ 0	$ 0

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