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Inventories (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Trade and other current receivables [abstract]    
Raw materials and consumables $ 22,395 $ 11,879
Work-in-progress 19,795 8,330
Finished goods 5,350 3,746
Service inventory 3,978 4,567
Inventories 51,518 28,522
Changes in raw materials and consumables, finished goods and work-in-progress recognized as cost of product and service revenues 60,803 49,710
Inventory write-down 1,246 1,888
Reversal of inventory write-down 136 434
Inventory net write-down $ 1,110 $ 1,454