Long-term financial investments - Schedule of Equity- Accounted Investments (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023
Investment Other Entities [Roll Forward]
Investments, beginning balance	$ 13,901
Investments, ending balance	8,238	$ 13,901
Long -Term Investment
Investment Other Entities [Roll Forward]
Investments, beginning balance	40,345	42,331
Contributions (Proceeds)		10,911
Change in Fair Value		(12,897)
Investments, ending balance		40,345
Long -Term Financial Investments
Investment Other Entities [Roll Forward]
Investments, beginning balance	40,345
Contributions (Proceeds)	11,958
Change in Fair Value	(14,788)
Investments, ending balance	37,515	40,345
Forsee Power \| Long -Term Investment
Investment Other Entities [Roll Forward]
Investments, beginning balance	14,969	18,470
Contributions (Proceeds)	0	0
Change in Fair Value	(12,699)	(3,501)
Investments, ending balance	2,270	14,969
Wisdom Motor \| Long -Term Investment
Investment Other Entities [Roll Forward]
Investments, beginning balance	4,100
Contributions (Proceeds)	0
Change in Fair Value	(2,200)
Investments, ending balance	1,900	4,100
Wisdom Motor \| Long -Term Financial Investments
Investment Other Entities [Roll Forward]
Investments, beginning balance	4,100	10,000
Contributions (Proceeds)		(1,000)
Change in Fair Value		(4,900)
Investments, ending balance		4,100
Quantron AG \| Long -Term Investment
Investment Other Entities [Roll Forward]
Investments, beginning balance	4,400
Contributions (Proceeds)	1
Change in Fair Value	(4,401)
Investments, ending balance	0	4,400
Quantron AG \| Long -Term Financial Investments
Investment Other Entities [Roll Forward]
Investments, beginning balance	4,400	5,333
Contributions (Proceeds)		3,304
Change in Fair Value		(4,237)
Investments, ending balance		4,400
HyCap Fund \| Long -Term Investment
Investment Other Entities [Roll Forward]
Investments, beginning balance	12,801	7,963
Contributions (Proceeds)	6,102	4,624
Change in Fair Value	5,084	214
Investments, ending balance	23,987	12,801
CleanH2 Fund \| Long -Term Investment
Investment Other Entities [Roll Forward]
Investments, beginning balance	4,075	565
Contributions (Proceeds)	5,328	3,983
Change in Fair Value	(360)	(473)
Investments, ending balance	9,043	4,075
Templewater Fund \| Long -Term Investment
Investment Other Entities [Roll Forward]
Investments, beginning balance	0
Contributions (Proceeds)	527
Change in Fair Value	(212)
Investments, ending balance	$ 315	$ 0

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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]]

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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: Total for all 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: Total for all joint ventures [member]]

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