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Revenues Based on Customer Location (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Segment Reporting Information [Line Items]      
Total revenues $ 87,507 $ 72,653 $ 59,499
United States      
Segment Reporting Information [Line Items]      
Total revenues 7,188 9,134 9,737
Europe, Middle East      
Segment Reporting Information [Line Items]      
Total revenues 11,007 10,901 7,064
Asia Pacific      
Segment Reporting Information [Line Items]      
Total revenues 69,312 52,618 42,698
China      
Segment Reporting Information [Line Items]      
Total revenues 41,059 30,030 29,982
S. Korea      
Segment Reporting Information [Line Items]      
Total revenues $ 17,842 $ 15,512 $ 6,173