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Inventories | 12 Months Ended
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Dec. 31, 2022
Inventory Disclosure [Abstract] |
Inventories | 4. Inventories Inventories consisted of the following:
|  | December 31, |
(table only in thousands) |  | 2022 |  |  | 2021 |
Raw materials |  | $ | 19,774 |  |  | $ | 13,405 |
Work in process |  |  | 7,183 |  |  |  | 5,147 |
Finished goods |  |  | 2,436 |  |  |  | 674 |
Obsolescence allowance |  |  | (2,867 | ) |  |  | (2,174 | )
Total inventories |  | $ | 26,526 |  |  | $ | 17,052 |
Amounts credited to the allowance for obsolete inventory and charged to cost of sales amounted to $0.1 million, $0.1 million and $0.5 million during 2022, 2021 and 2020, respectively. Items charged to the allowance for inventory write-offs were zero, $0.9 million and $0.1 million, during 2022, 2021 and 2020, 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 https://asc.fasb.org/topic&trid=2126998 + Details
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