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Revenues Based on Customer Location (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Segment Reporting Information [Line Items]        
Total revenues $ 17,846 $ 16,235 $ 51,457 $ 43,428
United States        
Segment Reporting Information [Line Items]        
Total revenues 2,144 3,482 7,310 8,335
Europe and Middle East        
Segment Reporting Information [Line Items]        
Total revenues 2,986 1,590 7,492 5,202
Asia Pacific        
Segment Reporting Information [Line Items]        
Total revenues 12,716 11,163 36,655 29,891
China        
Segment Reporting Information [Line Items]        
Total revenues 7,073 8,423 23,064 20,972
S. Korea        
Segment Reporting Information [Line Items]        
Total revenues $ 4,901 $ 2,131 $ 11,338 $ 0 [1]
[1] *) Less than 10%