Inventories - Schedule of Inventory (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Inventory Disclosure [Abstract]
Raw materials	$ 6,656	$ 6,697
Work-in-process	1,928	1,553
Finished goods	3,204	2,799
Total gross inventories	11,788	11,049
Raw materials	3,099	3,150
Work-in-process	504	431
Finished goods	1,161	1,111
Total reserve	4,764	4,692
Raw materials	3,557	3,547
Work-in-process	1,424	1,122
Finished goods	2,043	1,688
Total net inventories	$ 6,761	$ 6,357