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Inventories, net and Deferred Preservation Costs
 3 Months Ended
Mar. 31, 2023
Inventory Disclosure [Abstract]  
Inventories, net and Deferred Preservation Costs Inventories, net and Deferred Preservation Costs
Inventories, net at March 31, 2023 and December 31, 2022 were comprised of the following (in thousands):
March 31,
2023		December 31,
2022
Raw materials and supplies$36,322 $36,715 
Work-in-process11,319 10,476 
Finished goods28,632 27,287 
Total inventories, net $76,273 $74,478 
To facilitate product usage, we maintain consignment inventory of our On-X heart valves at domestic hospital locations and On-X heart valves and aortic stent grafts 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 March 31, 2023 we had $12.7 million in consignment inventory, with approximately 42% in domestic locations and 58% in international locations. As of December 31, 2022 we had $12.7 million in consignment inventory, with approximately 41% in domestic locations and 59% in international locations.
Total deferred preservation costs were $47.4 million and $46.4 million as of March 31, 2023 and December 31, 2022, respectively.
Inventory and deferred preservation costs obsolescence reserves were $2.1 million and $2.2 million as of March 31, 2023 and December 31, 2022, respectively.