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Revenues Based on Customer Location (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Total revenues	$ 72,653	$ 59,499	$ 50,808
United States
Segment Reporting Information [Line Items]
Total revenues	9,134	9,737	11,671
Europe, Middle East
Segment Reporting Information [Line Items]
Total revenues	10,901	7,064	5,655
Asia Pacific
Segment Reporting Information [Line Items]
Total revenues	52,618	42,698	33,482
China
Segment Reporting Information [Line Items]
Total revenues	30,030	29,982	20,568
S. Korea
Segment Reporting Information [Line Items]
Total revenues	$ 15,512	$ 6,173	$ 0	[1]
[1] *) Less than 10%

X

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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- Definition

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+ References

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