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Inventories
12 Months Ended
Dec. 31, 2018
Inventories Disclosure [Abstract]  
Inventories Disclosure [Text Block]

8. Inventories

Inventories consist of the following:

December 31,December 31,
20182017
(in thousands)
Finished goods$6,936$5,779
Work in process3,6671,042
Raw materials14,48410,027
Total$25,087$16,848