Inventories, net and Deferred Preservation Costs (Narrative) (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Inventory [Line Items]
Consignment inventory	$ 11,100	$ 12,700
Deferred preservation costs, net	49,391	46,371
Inventory valuation reserve	$ 2,700	$ 2,200
Domestic
Inventory [Line Items]
Consignment inventory percentage	43.00%	41.00%
International
Inventory [Line Items]
Consignment inventory percentage	57.00%	59.00%

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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