Inventories (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Components of inventories
Raw materials	$ 10,021	$ 9,783
Work in process	4,221	3,087
Finished goods	6,349	5,385
Inventories, net	$ 20,591	$ 18,255

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