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Segment Information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2014
item
Mar. 31, 2013
Dec. 31, 2013
Segment Information      
Number of operating segments 5    
Number of reportable segments 2    
Reconciliation of Segment profit (loss) to Income (loss) from continuing operations before income tax      
Net sales $ 90,841 $ 61,781  
Segment profit (Loss) (2,724) (15,658)  
Interest income (expense), net 164 192  
Amortization (2,903) (856)  
Equity-based compensation (4,722) (2,579)  
Restructuring (392) (531) (1,485)
Changes in contingent consideration 29,368    
Income (loss) before income taxes 18,791 (19,432)  
Operating segment | LED And Solar
      
Reconciliation of Segment profit (loss) to Income (loss) from continuing operations before income tax      
Net sales 70,755 42,307  
Segment profit (Loss) 2,124 (11,222)  
Amortization (2,579) (532)  
Equity-based compensation (2,173) (710)  
Restructuring (164) (423)  
Changes in contingent consideration 29,368    
Income (loss) before income taxes 26,576 (12,887)  
Operating segment | Data Storage
      
Reconciliation of Segment profit (loss) to Income (loss) from continuing operations before income tax      
Net sales 20,086 19,474  
Segment profit (Loss) (648) 375  
Amortization (324) (324)  
Equity-based compensation (699) (130)  
Restructuring (228) (50)  
Income (loss) before income taxes (1,899) (129)  
Unallocated
      
Reconciliation of Segment profit (loss) to Income (loss) from continuing operations before income tax      
Segment profit (Loss) (4,200) (4,811)  
Interest income (expense), net 164 192  
Equity-based compensation (1,850) (1,739)  
Restructuring   (58)  
Income (loss) before income taxes $ (5,886) $ (6,416)