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Summary of Significant Accounting Policies (Tables)
6 Months Ended
Jun. 30, 2019
Summary of Significant Accounting Policies [Abstract]  
Inventory, Major Classes, Policy [Policy Text Block]
 
 
As of June 30,
 
As of December 31,
 
 
2019
 
2018
 
 
(in thousands)
Raw materials
 
$
3,529

 
$
3,564

Work-in-process
 
424

 
232

Finished goods
 
324

 
884

Total inventory
 
$
4,277

 
$
4,680