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Inventory (Tables)
9 Months Ended
Sep. 30, 2019
Inventory Disclosure [Abstract]  
Schedule of inventory
Inventory consisted of the following as of September 30, 2019 and December 31, 2018 (in thousands):
 
 
September 30,
2019
 
December 31,
2018
Raw materials
 
$
3,858

 
$
4,961

Work in process
 
44

 
490

Finished goods
 
1,009

 
759

Total inventories
 
$
4,911

 
$
6,210