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Inventory (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Raw materials $ 8,937 $ 6,181
Work in process 5,496 4,328
Finished goods 5,432 4,879
Total inventory, gross 19,865 15,388
Inventory reserve 0 0
Total inventory, net $ 19,865 $ 15,388