Inventories - Schedule of Inventory (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Inventory Disclosure [Abstract]
Raw materials	$ 6,386	$ 6,369
Work-in-process	1,980	1,989
Finished goods	2,880	3,361
Total gross inventories	11,246	11,719
Raw materials	3,116	2,986
Work-in-process	451	389
Finished goods	1,105	1,089
Total reserve	4,672	4,464
Raw materials	3,270	3,383
Work-in-process	1,529	1,600
Finished goods	1,775	2,272
Total net inventories	$ 6,574	$ 7,255