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Inventories
3 Months Ended
Mar. 31, 2013
Inventories [Abstract]  
Inventories
4. Inventories

 

                 
(dollars in thousands)   March 31,
2013
    December 31,
2012
 

Raw materials and subassemblies

  $ 5,274     $ 2,508  

Finished goods

    1,144       1,133  

Parts for resale

    727       684  

Obsolescence allowance

    (709     (427
   

 

 

   

 

 

 
    $ 6,436     $ 3,898  
   

 

 

   

 

 

 

Amounts credited to the allowance for obsolete inventory and charged to cost of sales amounted to $69 and $56 for the three month periods ended March 31, 2013 and 2012, respectively.