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Inventories
6 Months Ended
Jun. 30, 2019
Inventories Disclosure [Abstract]  
Inventories Disclosure [Text Block]

7. Inventories

Inventories consist of the following:

June 30,December 31,
20192018
(in thousands)
Finished goods$6,729$6,936
Work in process4,1013,667
Raw materials14,45814,484
Total$25,288$25,087