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Inventories (Tables)
6 Months Ended
Jun. 30, 2018
Balance Sheet Related Disclosures [Abstract]  
Schedule of Inventory, Current [Table Text Block]
The following table summarizes inventories (in thousands):
 
June 30,
2018
 
December 31,
2017
Raw materials
$
1,771

 
$
1,222

Work in process
1,880

 
2,217

Finished goods
3,726

 
4,927

 
$
7,377

 
$
8,366