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Inventories
 12 Months Ended
Dec. 31, 2021
Inventories [Abstract]  
Inventories Inventories:
December 31, 2021December 31, 2020
Raw materials and consumables$22,395 $11,879 
Work-in-progress19,795 8,330 
Finished goods5,350 3,746 
Service inventory3,978 4,567 
$51,518 $28,522 

In 2021, the amount of raw materials and consumables, finished goods and work-in-progress recognized as cost of product and service revenues amounted to $60,803,000 (2020 - $49,710,000).
In 2021, the write-down of inventories to net realizable value amounted to $1,246,000 (2020 - $1,888,000) and the reversal of previously recorded write-downs amounted to $136,000 (2020 - $434,000), resulting in a net write-down of $1,110,000 (2020 - $1,454,000). Write-downs and reversals are included in either cost of product and service revenues, or research and product development expense, depending on the nature of inventory.