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Fair value measurement - Contingent consideration, Contingent copper consideration (Details)
$ in Thousands
 6 Months Ended
Jun. 30, 2023
USD ($)
item
$ / lb
Fair value measurement  
Number of contingent payments | item 2
Copper contingent consideration payment amount | $ $ 75,000
Trigger price 4.25
18-Month 18 months
Trigger price 4.50
24-Month 24 months