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INVENTORIES | 9 Months Ended
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Feb. 28, 2022
INVENTORIES |
INVENTORIES | 7. INVENTORIES Inventories are comprised of the following (in thousands):
|  | February 28, |  |  | May 31, |
|  | 2022 |  |  | 2021 |
Raw materials and sub-assemblies |  | $ | 9,286 |  |  | $ | 5,859 |
Work in process |  |  | 4,866 |  |  |  | 2,988 |
Finished goods |  |  | - |  |  |  | 2 |
|  | $ | 14,152 |  |  | $ | 8,849 |
For the three and nine months ended February 28, 2022, the Company wrote down $1,026,000 and $1,046,000 of inventory, respectively. For the three and nine months ended February 28, 2021, the Company wrote down $104,000 and $117,000 of inventory, respectively.

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- Definition The entire disclosure for inventory. Includes, but is not limited to, the basis of stating inventory, the method of determining inventory cost, the classes of inventory, and the nature of the cost elements included in inventory. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -URI http://asc.fasb.org/topic&trid=2126998 + Details
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