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Inventories (Tables)
6 Months Ended
Jun. 30, 2020
Inventory Disclosure [Abstract]  
Schedule of inventories
Inventories consist of the following (dollars in thousands):
June 30,
2020
December 31,
2019
(unaudited)
Raw materials$7,262  $4,582  
Work in process10,658  11,428  
Finished goods17,418  10,618  
Total$35,338  $26,628