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Selected Quarterly Financial Information (Details 3) (USD $)
 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2011
LED And Solar
Dec. 31, 2012
LED And Solar
Dec. 31, 2011
LED And Solar
Dec. 31, 2011
Personnel severance and related costs
Dec. 31, 2012
Personnel severance and related costs
Employee
Dec. 31, 2011
Personnel severance and related costs
Employee
Dec. 31, 2012
Equity compensation and related costs
Dec. 31, 2012
Other severance costs
Employee
Restructuring and other charges                            
Restructuring charges $ 1,800,000 $ 2,000,000   $ 3,813,000 $ 1,288,000 $ (179,000)   $ 1,233,000 $ 204,000 $ 1,300,000 $ 3,040,000 $ 1,288,000 $ 414,000  
Other severance costs                           400,000
Headcount reduction                     52 65   52
Impairment charges related to property and equipment             600,000              
Overstatement in discontinued operations tax benefit     3,400,000                      
Increase in reserve for slow moving and obsolete inventory   7,200,000                        
Inventory write downs $ 1,800,000