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Inventories, net and Deferred Preservation Costs
 6 Months Ended
Jun. 30, 2022
Inventory Disclosure [Abstract]  
Inventories, net and Deferred Preservation Costs Inventories, net and Deferred Preservation Costs
Inventories at June 30, 2022 and December 31, 2021 were comprised of the following (in thousands):
June 30,
2022		December 31,
2021
Raw materials and supplies$34,565 $35,780 
Work-in-process11,856 9,712 
Finished goods27,897 31,479 
Total inventories, net $74,318 $76,971 
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 June 30, 2022 we had $14.2 million in consignment inventory, with approximately 39% in domestic locations and 61% in international locations. As of December 31, 2021 we had $12.9 million in consignment inventory, with approximately 43% in domestic locations and 57% in international locations.
Total deferred preservation costs were $44.8 million and $42.9 million as of June 30, 2022 and December 31, 2021, respectively.
Inventory and deferred preservation costs obsolescence reserves were $2.6 million and $3.2 million as of June 30, 2022 and December 31, 2021, respectively.