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Inventories | 12 Months Ended
--- | ---
Dec. 31, 2021
Inventories [Abstract] |
Inventories | Inventories:
|  | December 31, 2021 |  | December 31, 2020
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 |
|  | $ | 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.

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