Quarterly report pursuant to Section 13 or 15(d)

Inventories (Details)

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Inventories (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Inventory Disclosure [Abstract]    
Raw materials $ 2,289 $ 2,300
Work in process 273 215
Finished goods 211 262
Inventories $ 2,773 $ 2,777