Quarterly report pursuant to Section 13 or 15(d)

Inventories, net (Details)

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Inventories, net (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
Raw materials $ 2,800 $ 2,676
Work in progress 446 331
Finished goods 673 730
Inventory 3,919 3,737
Less: inventory reserve (195) (366)
Inventories, net $ 3,724 $ 3,371