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Revenues Based on Customer Location (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Segment Reporting Information [Line Items]        
Total revenues $ 16,235 $ 14,098 $ 43,428 $ 36,987
United States        
Segment Reporting Information [Line Items]        
Total revenues 3,482 1,904 8,335 8,639
Europe and Middle East        
Segment Reporting Information [Line Items]        
Total revenues 1,590 934 5,202 4,272
Asia Pacific        
Segment Reporting Information [Line Items]        
Total revenues 11,163 11,260 29,891 24,076
China        
Segment Reporting Information [Line Items]        
Total revenues $ 8,423 $ 8,048 $ 20,972 14,534
Taiwan        
Segment Reporting Information [Line Items]        
Total revenues [1] [1] [1] $ 3,735
S. Korea        
Segment Reporting Information [Line Items]        
Total revenues $ 2,131 $ 2,249 [1] [1]
[1] *) Less than 10%