Inventories and Deferred Preservation Costs, net (Schedule of Deferred Preservation Costs) (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Inventory [Line Items]
Total deferred preservation costs, net	$ 46,371	$ 42,863
Cardiac tissues
Inventory [Line Items]
Total deferred preservation costs, net	21,799	20,591
Vascular tissues
Inventory [Line Items]
Total deferred preservation costs, net	$ 24,572	$ 22,272

Donated human tissue is procured from deceased human donors by tissue banks and organ procurement organizations, which consign the tissue to the Company for processing, preservation, and distribution. By federal law, human tissues cannot be bought or sold, so the preservation process is a manufacturing process that is accounted for using the same principles as inventory costing. Preservation costs consist primarily of direct labor and materials and indirect costs which are stated at the lower of cost or market value on a first in, first out basis and are deferred until revenue is recognized upon shipment of the tissue to an implanting facility.

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