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Commitments and Contingencies and Other Matters (Details 2) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Reconciliation of short-term liability      
Balance at the beginning of the period $ 1,875   $ 714
Short-term/long-term reclassification     58
Cash payments (2,827) (1,774) (850)
Balance at the end of the period 533 1,875  
Reconciliation of long-term liability      
Balance at the beginning of the period     58
Short-term/long-term reclassification     (58)
Personnel severance and related costs
      
Reconciliation of short-term liability      
Restructuring 1,485 2,693 1,034
Operating segment | LED And Solar
      
Reconciliation of short-term liability      
Cash payments (1,282) (960) (138)
Balance at the end of the period 183    
Operating segment | LED And Solar | Personnel severance and related costs
      
Reconciliation of short-term liability      
Restructuring 1,017 874 672
Operating segment | Data Storage
      
Reconciliation of short-term liability      
Balance at the beginning of the period     178
Short-term/long-term reclassification     58
Cash payments (1,368) (504) (159)
Balance at the end of the period 350    
Reconciliation of long-term liability      
Balance at the beginning of the period     58
Short-term/long-term reclassification     (58)
Operating segment | Data Storage | Personnel severance and related costs
      
Reconciliation of short-term liability      
Restructuring 410 1,684 51
Unallocated
      
Reconciliation of short-term liability      
Balance at the beginning of the period     536
Cash payments (177) (310) (553)
Unallocated | Personnel severance and related costs
      
Reconciliation of short-term liability      
Restructuring $ 58 $ 135 $ 311