Quarterly report pursuant to Section 13 or 15(d)

Inventories, net (Details)

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Inventories, net (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
Raw materials $ 2,967 $ 2,676
Work in progress 303 331
Finished goods 335 730
Inventory 3,605 3,737
Less: inventory reserve (305) (366)
Inventories, net $ 3,300 $ 3,371