Quarterly report pursuant to Section 13 or 15(d)

Inventories (Details)

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Inventories (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Raw materials $ 10,384 $ 9,522
Work in progress 1,960 2,153
Finished goods 28,937 32,372
Total inventories $ 41,281 $ 44,047