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3. Inventories, net (Tables)
3 Months Ended
Mar. 31, 2013
Inventories Net Tables  
Components of inventory
    March 31, 2013     December 31, 2012  
Finished goods   $ 4,519     $ 4,316  
Work in process     5,833       6,278  
Raw materials     3,128       2,751  
    $ 13,480     $ 13,345