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Segment Information (Geographic Information) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Revenue, net $ 16,570 $ 17,111 $ 46,040 $ 45,818
Japan        
Revenue, net 14,295 11,604 38,835 25,678
Taiwan        
Revenue, net 1,602 1,866 4,682 6,819
Korea        
Revenue, net 217 388 803 2,759
China        
Revenue, net 189 2,262 608 4,641
Europe        
Revenue, net 124 484 463 1,504
United States        
Revenue, net 23 163 92 3,354
Other        
Revenue, net $ 120 $ 344 $ 557 $ 1,063