Quarterly report pursuant to Section 13 or 15(d)

Inventories (Details)

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Inventories (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Raw materials $ 10,625 $ 9,522
Work in progress 1,937 2,153
Finished goods 30,479 32,372
Total inventories $ 43,041 $ 44,047