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INVENTORY | 12 Months Ended
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Dec. 31, 2022
INVENTORY |
INVENTORY | NOTE 5. INVENTORY Inventory is comprised of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ | ​ | 2022 | ​ | 2021
Parts and supplies | ​ | $ | 70,228 | ​ | $ | 63,628
Work in progress | ​ |  | 14,394 | ​ |  | 9,241
Inventory | ​ | $ | 84,622 | ​ | $ | 72,869
​ During the years ended December 31, 2022, 2021 and 2020 we recorded write–downs to inventory of $1.6 million, $1.0 million and $1.3 million, respectively, for inventory considered to be excess, obsolete or carried at an amount in excess of net realizable value.

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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 https://asc.fasb.org/topic&trid=2126998 + Details
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