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Summary of Significant Accounting Policies (Tables)
3 Months Ended
Mar. 31, 2019
Summary of Significant Accounting Policies [Abstract]  
Inventory, Major Classes, Policy [Policy Text Block]
 
 
As of March 31,
 
As of December 31,
 
 
2019
 
2018
 
 
(in thousands)
Raw materials
 
$
3,571

 
$
3,564

Work-in-process
 
232

 
232

Finished goods
 
803

 
884

Total inventory
 
$
4,606

 
$
4,680