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Other investments (Details) - USD ($)
$ in Thousands
12 Months Ended
Nov. 15, 2024
Apr. 10, 2024
Feb. 19, 2024
Jan. 26, 2024
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Fair value of investments in equity instrument [Abstract]              
Other investments         $ 23,069 $ 23,953 $ 3,825
Fair value gain (loss)         1,186 9,720 0
Investment in ZeroNorth A/S (formerly known as Alpha Ori Technology Holdings Pte Ltd "Alpha Ori") [Member]              
Fair value of investments in equity instrument [Abstract]              
Other investments         2,344 3,428 3,269
Fair value gain (loss)     $ (600)        
Additional working capital   $ 300          
Pre-merger promissory loan       $ 400      
Change in fair value         $ 1,200    
Investment in ZeroNorth A/S (formerly known as Alpha Ori Technology Holdings Pte Ltd "Alpha Ori") [Member] | Top of range [member]              
Fair value of investments in equity instrument [Abstract]              
Ownership interest acquired         20.00%    
Investment in Diginex Solutions (HK) Limited ("Diginex") [Member]              
Fair value of investments in equity instrument [Abstract]              
Other investments         $ 525 525 501
Fair value gain (loss)           (220)  
Additional working capital           250  
Investment in Diginex Solutions (HK) Limited ("Diginex") [Member] | Top of range [member]              
Fair value of investments in equity instrument [Abstract]              
Ownership interest acquired         20.00%    
Investment in Clean Hydrogen Works, LA-1, LLC ("CHW-LA1") [Member]              
Fair value of investments in equity instrument [Abstract]              
Other investments         $ 20,000 20,000 55
Total consideration           10,000  
Fair value gain (loss)           9,900  
Investment in Clean Hydrogen Works, LA-1, LLC ("CHW-LA1") [Member] | Top of range [member]              
Fair value of investments in equity instrument [Abstract]              
Ownership interest acquired         20.00%    
Investment in Vanguard Tech, Inc. ("Vanguard") [Member]              
Fair value of investments in equity instrument [Abstract]              
Other investments         $ 200 $ 0 $ 0
Total consideration $ 200            
Investment in Vanguard Tech, Inc. ("Vanguard") [Member] | Top of range [member]              
Fair value of investments in equity instrument [Abstract]              
Ownership interest acquired         20.00%