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Inventories and Deferred Preservation Costs, net | 12 Months Ended
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Dec. 31, 2022
Inventory Disclosure [Abstract] |
Inventories and Deferred Preservation Costs, net | Inventories and Deferred Preservation Costs, net Inventories, net at December 31, 2022 and 2021 were comprised of the following (in thousands):
| 2022 |  | 2021
Raw materials and supplies | $ | 36,715 |  |  | $ | 35,780 |
Work-in-process | 10,476 |  |  | 9,712 |
Finished goods | 27,287 |  |  | 31,479 |
Total inventories, net | $ | 74,478 |  |  | $ | 76,971 |
Deferred preservation costs, net at December 31, 2022 and 2021 were comprised of the following (in thousands):
| 2022 |  | 2021
Cardiac tissues | $ | 21,799 |  |  | $ | 20,591 |
Vascular tissues | 24,572 |  |  | 22,272
Total deferred preservation costs, net | $ | 46,371 |  |  | $ | 42,863 |
To facilitate product usage, we maintain consignment inventory of our On-X heart valves at domestic hospital locations and On-X heart valves, aortic stent grafts, and AMDS products at international hospital locations. We retain title and control over this consignment inventory until the device is implanted, at which time we invoice the hospital and recognize revenue. As of December 31, 2022 we had $12.7 million in consignment inventory, with approximately 41% in domestic locations and 59% in foreign locations. As of December 31, 2021 we had $12.9 million in consignment inventory, with approximately 43% in domestic locations and 57% in foreign locations. Inventory and deferred preservation costs obsolescence reserves were $2.2 million and $3.2 million as of December 31, 2022 and 2021, 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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