Long-term financial investments - Schedule of Equity- Accounted Investments (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022
Investment Other Entities [Roll Forward]
Investments, beginning balance	$ 24,026
Investments, ending balance	13,901	$ 24,026
Long -Term Investment
Investment Other Entities [Roll Forward]
Investments, beginning balance	42,331	41,310
Contributions (Proceeds)		17,913
Change in Fair Value		(16,892)
Investments, ending balance		42,331
Long -Term Financial Investments
Investment Other Entities [Roll Forward]
Investments, beginning balance	42,331
Contributions (Proceeds)	10,911
Change in Fair Value	(12,897)
Investments, ending balance	40,345	42,331
Forsee Power \| Long -Term Investment
Investment Other Entities [Roll Forward]
Investments, beginning balance	18,470	33,335
Contributions (Proceeds)	0	0
Change in Fair Value	(3,501)	(14,865)
Investments, ending balance	14,969	18,470
Wisdom Motor \| Long -Term Investment
Investment Other Entities [Roll Forward]
Investments, beginning balance	10,000
Contributions (Proceeds)	(1,000)
Change in Fair Value	(4,900)
Investments, ending balance	4,100	10,000
Wisdom Motor \| Long -Term Financial Investments
Investment Other Entities [Roll Forward]
Investments, beginning balance	10,000	0
Contributions (Proceeds)		10,000
Change in Fair Value		0
Investments, ending balance		10,000
Quantron AG \| Long -Term Investment
Investment Other Entities [Roll Forward]
Investments, beginning balance	5,333
Contributions (Proceeds)	3,304
Change in Fair Value	(4,237)
Investments, ending balance	4,400	5,333
Quantron AG \| Long -Term Financial Investments
Investment Other Entities [Roll Forward]
Investments, beginning balance	5,333	0
Contributions (Proceeds)		5,183
Change in Fair Value		150
Investments, ending balance		5,333
HyCap Fund \| Long -Term Investment
Investment Other Entities [Roll Forward]
Investments, beginning balance	7,963	7,636
Contributions (Proceeds)	4,624	1,924
Change in Fair Value	214	(1,597)
Investments, ending balance	12,801	7,963
CleanH2 Fund \| Long -Term Investment
Investment Other Entities [Roll Forward]
Investments, beginning balance	565	339
Contributions (Proceeds)	3,983	806
Change in Fair Value	(473)	(580)
Investments, ending balance	$ 4,075	$ 565

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Investment Other Entities

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The amount of investments accounted for using the equity method. The equity method is a method of accounting whereby the investment is initially recognised at cost and adjusted thereafter for the post-acquisition change in the investor's share of net assets of the investee. The investor's profit or loss includes its share of the profit or loss of the investee. The investor's other comprehensive income includes its share of the other comprehensive income of the investee. [Refer: At cost [member]]

+ References

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The cash outflow to acquire interests in joint ventures (other than payments for those instruments considered to be cash equivalents or those held for dealing or trading purposes), classified as investing activities. [Refer: Joint ventures [member]]

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The cash inflow from sales of interests in joint ventures (other than receipts for those instruments considered to be cash equivalents and those held for dealing or trading purposes), classified as investing activities. [Refer: Joint ventures [member]]

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