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Revenues Based on Customer Location (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Segment Reporting Information [Line Items]        
Total revenues $ 17,103 $ 13,359 $ 33,611 $ 27,193
United States        
Segment Reporting Information [Line Items]        
Total revenues 3,406 2,892 5,166 4,853
Europe and Middle East        
Segment Reporting Information [Line Items]        
Total revenues 2,032 2,167 4,506 3,612
Asia Pacific        
Segment Reporting Information [Line Items]        
Total revenues 11,665 8,300 23,939 18,728
China        
Segment Reporting Information [Line Items]        
Total revenues 7,099 5,071 15,991 12,549
S. Korea        
Segment Reporting Information [Line Items]        
Total revenues $ 3,734 $ 0 [1] $ 6,437 $ 0 [1]
[1] *) Less than 10%