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Segment Information (Geographic Information) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Revenue, net $ 15,078 $ 15,166 $ 29,470 $ 28,707
Japan        
Revenue, net 12,725 8,647 24,540 14,073
Taiwan        
Revenue, net 1,601 3,239 3,080 4,953
Korea        
Revenue, net 265 775 586 2,371
Europe        
Revenue, net 156 507 339 1,021
China        
Revenue, net 139 1,413 419 2,379
United States        
Revenue, net 36 145 69 3,191
Other        
Revenue, net $ 156 $ 440 $ 437 $ 719