Inventory (Tables)

3 Months Ended

Mar. 31, 2020

Inventory [Line Items]

Schedule of Inventory, Current [Table Text Block]

Inventories consisted of the following:

(in thousands)	March 31, 2020		December 31, 2019
Raw materials	$	4,204	$	3,739
Work in process	1,894		1,170
Finished goods	4,444		3,152
Total inventory (1)	$	10,542	$	8,061