Inventory (Tables)

3 Months Ended

Mar. 31, 2019

Inventory [Line Items]

Schedule of Inventory, Current [Table Text Block]

Inventories consisted of the following:

	March 31,		December 31,
(in thousands)	2019		2018
Raw materials	$	6,125	$	6,214
Work in process	1,089		549
Finished goods	8,333		12,179
Total inventory	$	15,547	$	18,942