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Inventories and Deferred Preservation Costs
 12 Months Ended
Dec. 31, 2024
Inventory Disclosure [Abstract]  
Inventories and Deferred Preservation Costs Inventories and Deferred Preservation Costs
Inventories consist of the following (in thousands):
December 31,
20242023
Raw materials and supplies$35,295 $36,907 
Work-in-process13,926 12,687 
Finished goods30,545 32,382 
Inventories$79,766 $81,976 
Deferred preservation costs consist of the following (in thousands):
December 31,
20242023
Cardiac tissues$26,489 $24,823 
Vascular tissues25,212 24,981 
Deferred preservation costs$51,701 $49,804 
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 we receive a notification of implantation, at which time we invoice the hospital and recognize revenue. As of December 31, 2024 we had $12.2 million in consignment inventory, with approximately 39% in domestic locations and 61% in foreign locations. As of December 31, 2023 we had $10.7 million in consignment inventory, with approximately 44% in domestic locations and 56% in foreign locations.