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Inventories | 9 Months Ended
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Sep. 30, 2021
Inventory Disclosure [Abstract] |
Inventories | 4. Inventories
(table only in thousands) |  | September 30, 2021 |  |  | December 31, 2020 |
Raw materials |  | $ | 14,603 |  |  | $ | 14,262 |
Work in process |  |  | 5,916 |  |  |  | 5,594 |
Finished goods |  |  | 945 |  |  |  | 496 |
Obsolescence allowance |  |  | (2,855 | ) |  |  | (3,009 | )
Total inventories |  | $ | 18,609 |  |  | $ | 17,343 |
Amounts credited to the allowance for obsolete inventory and charged to cost of sales amounted to $0.2 million for the three-month periods ended September 30, 2021 and 2020, and $0.4 million and $0.5 million for the nine-month periods ended September 30, 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 http://asc.fasb.org/topic&trid=2126998 + Details
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