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Restructuring (Details) (USD $)
1 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2012
Mar. 31, 2012
Dec. 31, 2012
Cost of sales
Dec. 31, 2012
Operating Expenses
Restructuring Cost and Reserve        
Reduction in workforce 29.00%      
Restructuring charge   $ 373,000 $ 93,000 $ 280,000