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Inventories | 12 Months Ended
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Dec. 31, 2021
Inventory Disclosure [Abstract] |
Inventories | Inventories Inventories are as follows (in thousands):
| December 31,
| 2021 |  | 2020
Raw materials | $ | 5,610 |  |  | $ | 7,190 |
Finished goods | 13,985 |  |  | 15,705 |
Inventories | 19,595 |  |  | 22,895 |
Less reserve for excess and obsolete inventory | (10,141) |  |  | (11,058) |
Inventories, net | $ | 9,454 |  |  | $ | 11,837 |
Changes in the reserve for excess and obsolete inventory are as follows (in thousands):
| Years ended December 31, |  |
| 2021 |  | 2020 |  |
Balance, beginning of year | $ | 11,058 |  |  | $ | 5,698 |  |  |
Charged to provisions | 623 |  |  | 12,261 |  |  |
Deductions for sales and disposals | (1,540) |  |  | (6,901) |  |  |
Balance, end of the year | $ | 10,141 |  |  | $ | 11,058 |  |  |
The provisions recorded in the year ended December 31, 2021 were $0.6 million for the CT segment and nil for the DA segment. The provisions recorded in the year ended December 31, 2020 were $8.4 million for the CT segment and $3.9 million for the DA segment.

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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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