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Inventories And Deferred Preservation Costs
 12 Months Ended
Dec. 31, 2019
Inventories And Deferred Preservation Costs [Abstract]  
Inventories And Deferred Preservation Costs 6. Inventories and Deferred Preservation Costs

Inventories at December 31, 2019 and 2018 are comprised of the following (in thousands):

2019

2018

Raw materials and supplies

$

21,180

$

17,381

Work-in-process

5,127

3,858

Finished goods

26,764

24,239

Total inventories

$

53,071

$

45,478

Deferred preservation costs at December 31, 2019 and 2018 are comprised of the following (in thousands):

2019

2018

Cardiac tissues

$

15,365

$

15,972

Vascular tissues

17,186

17,202

Total deferred preservation costs

$

32,551

$

33,174

We maintain consignment inventory of our On-X heart valves at domestic hospital locations and On-X heart valves and JOTEC products at international hospital locations to facilitate usage. We retain title to 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, 2019 we had $12.0 million in consignment inventory, with approximately 51% in domestic locations and 49% in foreign locations. As of December 31, 2018 we had $11.2 million in consignment inventory, with approximately 55% in domestic locations and 45% in foreign locations.