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Revenues Based on Customer Location (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Segment Reporting Information [Line Items]        
Revenues $ 21,413 $ 24,044 $ 56,476 $ 65,906
United States        
Segment Reporting Information [Line Items]        
Revenues 2,259 1,237 6,087 6,162
Europe and Middle East        
Segment Reporting Information [Line Items]        
Revenues 6,139 1,267 11,305 7,451
Asia Pacific        
Segment Reporting Information [Line Items]        
Revenues 13,015 21,540 39,084 52,293
China        
Segment Reporting Information [Line Items]        
Revenues 10,192 15,188 23,127 31,008
S. Korea        
Segment Reporting Information [Line Items]        
Revenues [1] 5,076 7,152 13,852
Germany        
Segment Reporting Information [Line Items]        
Revenues 5,600 [1] 8,582 [1]
Japan        
Segment Reporting Information [Line Items]        
Revenues [1] [1] $ 6,116 [1]
[1] Less than 10%