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2. Inventories, net (Tables)
 12 Months Ended
Dec. 31, 2013
Inventories Net Tables  
Schedule of components of inventory
    December 31,  
    2013   2012  
               
Finished goods     $ 3,525     $ 4,316  
Work in process      5,702     6,278  
Raw materials     2,348     2,751  
    $ 11,575   $ 13,345  
Schedule of changes in allowance for obsolete or slow moving inventory
    Years Ended December 31,
    2013   2012  
               
Balance, beginning of year     $ 2,832     $ 2,765    
Charged to cost of sales     140     164  
Disposal of inventory     (12)     (97)  
Balance, end of year   $ 2,960   $ 2,832