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SIGNIFICANT CUSTOMERS AND GEOGRAPHIC NET REVENUES Geographic Net Revevnues (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Schedule of Revenues by Geography [Line Items]
NET REVENUES	$ 108,249	$ 111,255	$ 107,563	$ 104,688	$ 102,436	$ 101,625	$ 97,571	$ 88,036	$ 431,755	$ 389,668	$ 344,609
United States of America
Schedule of Revenues by Geography [Line Items]
NET REVENUES									16,647	14,948	14,759
Hong Kong/China
Schedule of Revenues by Geography [Line Items]
NET REVENUES									227,335	198,858	173,202
Taiwan
Schedule of Revenues by Geography [Line Items]
NET REVENUES									50,307	50,324	47,279
Korea
Schedule of Revenues by Geography [Line Items]
NET REVENUES									38,012	41,996	34,264
Western Europe (excluding Germany)
Schedule of Revenues by Geography [Line Items]
NET REVENUES									48,230	41,214	38,028
Japan
Schedule of Revenues by Geography [Line Items]
NET REVENUES									20,769	19,767	16,994
Germany
Schedule of Revenues by Geography [Line Items]
NET REVENUES									11,558	7,563	7,802
Other
Schedule of Revenues by Geography [Line Items]
NET REVENUES									$ 18,897	$ 14,998	$ 12,281

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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.

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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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