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Inventories (Tables)
3 Months Ended
Mar. 31, 2020
Inventory Disclosure [Abstract]  
Schedule of inventories
Inventories consist of the following (dollars in thousands):
March 31,
2020
December 31,
2019
(unaudited)
Raw materials$4,331  $4,582  
Work in process8,221  11,428  
Finished goods11,866  10,618  
Total$24,418  $26,628