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Geographic Information and Major Customer Data (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Summary information about geographic areas        
Total revenues $ 13,592 $ 14,388 $ 28,704 $ 29,440
United States [Member]
       
Summary information about geographic areas        
Total revenues 3,179 3,376 6,177 6,552
Europe and Middle East [Member]
       
Summary information about geographic areas        
Total revenues 3,412 3,840 7,090 11,305
Asia Pacific [Member]
       
Summary information about geographic areas        
Total revenues 7,001 7,172 15,437 11,583
Germany [Member]
       
Summary information about geographic areas        
Total revenues 1,606 2,177 3,399 7,743
Switzerland [Member]
       
Summary information about geographic areas        
Total revenues       3,112
Japan [Member]
       
Summary information about geographic areas        
Total revenues     3,140  
China [Member]
       
Summary information about geographic areas        
Total revenues 4,056 3,556 9,294 6,336
S. Korea [Member]
       
Summary information about geographic areas        
Total revenues $ 1,619