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Inventories net | 12 Months Ended
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Dec. 31, 2022
Inventories net |
Inventories, Net | 2. Inventories, net On July 1, 2021, the Company changed its accounting for inventory to burden the material at the time of purchase receipts. Prior to July 1, 2021, the Company applied the material burden at the time the inventory was issued to work in progress. The Company believes that this method improves financial reporting by better reflecting the current value of inventory on the consolidated balance sheets, by providing better matching of revenues and expenses. Inventories, which are presented net of allowance for slow-moving, excess and obsolete inventory, consisted of the following:
|  | December 31, 2022 |  |  | December 31, 2021 |
Finished goods |  | $ | 2,965 |  |  | $ | 2,335 |
Work in process |  |  | 7,313 |  |  |  | 4,527 |
Raw materials |  |  | 11,827 |  |  |  | 10,116 |
|  | $ | 22,105 |  |  | $ | 16,978 |
Changes in the allowance for slow-moving, excess, and obsolete inventory are as follows:
|  | Years Ended December 31, |
|  | 2022 |  |  | 2021 |
Balance, beginning of year |  | $ | 1,288 |  |  | $ | 588 |
Charged to cost of sales |  |  | 81 |  |  |  | 700 |
Disposal of inventory |  |  | (122 | ) |  |  | — |
Balance, end of year |  | $ | 1,247 |  |  | $ | 1,288 |
During the year ended December 31, 2022, the Company recorded one-time, non-cash write-offs of new product development materials and inventory of $900 related to the BKR products, $646 was recorded in Selling, general and administrative expenses and $254 was recorded as cost of products. Direct write-off's were not significant during the year ended December 31, 2021.

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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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