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Inventories and Deferred Preservation Costs, net
 12 Months Ended
Dec. 31, 2023
Inventory Disclosure [Abstract]  
Inventories and Deferred Preservation Costs, net Inventories and Deferred Preservation Costs, net
Inventories, net at December 31, 2023 and 2022 were comprised of the following (in thousands):
20232022
Raw materials and supplies$36,907 $36,715 
Work-in-process12,687 10,476 
Finished goods32,382 27,287 
Total inventories, net$81,976 $74,478 
Deferred preservation costs, net at December 31, 2023 and 2022 were comprised of the following (in thousands):
20232022
Cardiac tissues$24,823 $21,799 
Vascular tissues24,981 24,572 
Total deferred preservation costs, net$49,804 $46,371 
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 notice of implantation is received, at which time we invoice the hospital and recognize revenue. As of December 31, 2023 we had $10.7 million in consignment inventory, with approximately 44% in domestic locations and 56% in foreign locations. As of December 31, 2022 we had $12.7 million in consignment inventory, with approximately 41% in domestic locations and 59% in foreign locations.
Inventory and deferred preservation costs obsolescence reserves were $3.0 million and $2.2 million as of December 31, 2023 and 2022, respectively.