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O. SEGMENT AND GEOGRAPHIC INFORMATION (Tables)
12 Months Ended
Dec. 31, 2013
Segment Reporting [Abstract]  
Revenue and asset information by geographic region

   For the year ended December 31, 
   2013   2012   2011 
Revenues:  (in thousands)  
United States  $14,705   $12,192   $18,767 
Taiwan   31,863    15,200    6,547 
China   31,856    36,029    22,526 
   $78,424   $63,421   $47,840 

 

   As of December 31, 
   2013   2012   2011 
Long-lived assets:   (in thousands)  
United States  $9,415    8,966   $9,457 
Taiwan   7,192    3,719    2,325 
China   16,337    13,595    14,052 
   $32,944   $26,280   $25,834