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Revenues Based on Customer Location (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Segment Reporting Information [Line Items]
Total revenues	$ 17,569	$ 21,287
United States
Segment Reporting Information [Line Items]
Total revenues	1,707	1,303
Europe and Middle East
Segment Reporting Information [Line Items]
Total revenues	2,453	3,931
Asia Pacific
Segment Reporting Information [Line Items]
Total revenues	13,409	16,053
China
Segment Reporting Information [Line Items]
Total revenues	6,152	9,742
S. Korea
Segment Reporting Information [Line Items]
Total revenues	2,802	$ 3,749
Japan
Segment Reporting Information [Line Items]
Total revenues	$ 2,624

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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+ References

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