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Revenues Based on Customer Location (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Segment Reporting Information [Line Items]      
Total revenues $ 59,499 $ 50,808 $ 48,900
United States      
Segment Reporting Information [Line Items]      
Total revenues 9,737 11,671 6,067
Europe and Middle East      
Segment Reporting Information [Line Items]      
Total revenues 7,064 5,655 13,384
Asia Pacific      
Segment Reporting Information [Line Items]      
Total revenues $ 42,698 $ 33,482 29,449
Germany      
Segment Reporting Information [Line Items]      
Total revenues [1] [1] 5,543
China      
Segment Reporting Information [Line Items]      
Total revenues $ 29,982 $ 20,568 $ 20,472
S. Korea      
Segment Reporting Information [Line Items]      
Total revenues $ 6,173 [1] [1]
[1] *) Less than 10%