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Inventory (Tables)
6 Months Ended
Jun. 30, 2019
Inventory Disclosure [Abstract]  
Schedule of inventory
Inventory consisted of the following as of June 30, 2019 and December 31, 2018 (in thousands):
 
 
June 30,
2019
 
December 31,
2018
Raw materials
 
$
3,950

 
$
4,961

Work in process
 

 
490

Finished goods
 
1,207

 
759

Total inventories
 
$
5,157

 
$
6,210