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Inventories
3 Months Ended
Mar. 31, 2019
Inventories Disclosure [Abstract]  
Inventories Disclosure [Text Block]

7. Inventories

Inventories consist of the following:

March 31,December 31,
20192018
(in thousands)
Finished goods$7,679$6,936
Work in process3,8343,667
Raw materials15,04414,484
Total$26,557$25,087