Inventories (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Inventory Disclosure [Abstract]
Raw materials	$ 8,962	$ 8,231
Work in progress	876	616
Finished goods	9,944	8,532
Reserve for obsolescence	1,996	1,304
Total	$ 17,786	$ 16,075	[1]

[1] Derived from the audited December 31, 2017 financial statements