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Selected Quarterly Financial Information (Details 5) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Restructuring and other charges          
Restructuring charges $ 1,800,000 $ 2,000,000 $ 1,485,000 $ 3,813,000 $ 1,288,000
Increase in reserve for slow moving and obsolete inventory   7,200,000      
Inventory write downs 1,800,000        
Personnel severance and related costs
          
Restructuring and other charges          
Restructuring charges     1,485,000 3,040,000 1,288,000
Headcount reduction       52 65
Equity compensation and related costs
          
Restructuring and other charges          
Restructuring charges       414,000  
Other severance costs
          
Restructuring and other charges          
Other severance costs       $ 400,000  
Headcount reduction       52