Inventories, Net And Deferred Preservation Costs	12 Months Ended
	Dec. 31, 2021
Inventories, Net And Deferred Preservation Costs [Abstract]
Inventories, Net And Deferred Preservation Costs	7. Inventories, net and Deferred Preservation Costs Inventories, net at December 31, 2021 and 2020 are comprised of the following (in thousands): 2021 2020Raw materials and supplies$ 35,780 $ 33,625Work-in-process 9,712 6,318Finished goods 31,479 33,095Total inventories, net$ 76,971 $ 73,038 Deferred preservation costs, net at December 31, 2021 and 2020 are comprised of the following (in thousands): 2021 2020Cardiac tissues$ 20,591 $ 17,374Vascular tissues 22,272 19,172Total deferred preservation costs, net$ 42,863 $ 36,546 To facilitate product usage, we maintain consignment inventory of our On-X heart valves at domestic hospital locations and On-X heart valves, JOTEC Products, 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, 2021 we had $12.9 million in consignment inventory, with approximately 43% in domestic locations and 57% in foreign locations. As of December 31, 2020 we had $11.9 million in consignment inventory, with approximately 47% in domestic locations and 53% in foreign locations. Inventory and deferred preservation costs obsolescence reserves were $3.2 million and $3.5 million as of December 31, 2021 and 2020, respectively.