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Balance Sheet Account Detail Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Balance Sheet Related Disclosures [Abstract]    
Raw materials $ 3,713 $ 3,901
Work-in-process 4,648 5,102
Finished goods 10,236 9,084
Inventories $ 18,597 $ 18,087