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N. SEGMENT AND GEOGRAPHIC INFORMATION - REVENUES (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2016 USD ($) item	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Number of Reportable segment | item									1
Revenues	$ 84,900	$ 70,137	$ 55,254	$ 50,422	$ 52,952	$ 57,085	$ 49,632	$ 30,234	$ 260,713	$ 189,903	$ 130,449
UNITED STATES
Revenues									18,035	16,766	30,723
TAIWAN, PROVINCE OF CHINA
Revenues									161,611	141,107	77,680
CHINA
Revenues									$ 81,067	$ 32,030	$ 22,046

X

- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ 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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