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Inventories and Deferred Preservation Costs, net
 12 Months Ended
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):
20222021
Raw materials and supplies$36,715 $35,780 
Work-in-process10,476 9,712 
Finished goods27,287 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):
20222021
Cardiac tissues$21,799 $20,591 
Vascular tissues24,572 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.