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CONCENTRATION OF RISK, Revenues by Geographic Area (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Concentration Risk [Line Items]
Revenues	$ 31,223us-gaap_Revenues	$ 37,839us-gaap_Revenues
South Korea [Member]
Concentration Risk [Line Items]
Revenues	22,222us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_KR	22,956us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_KR
Japan [Member]
Concentration Risk [Line Items]
Revenues	7,760us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_JP	14,058us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_JP
Taiwan [Member]
Concentration Risk [Line Items]
Revenues	583us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_TW	321us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_TW
Other [Member]
Concentration Risk [Line Items]
Revenues	433us-gaap_Revenues / us-gaap_StatementGeographicalAxis = us-gaap_AllOtherSegmentsMember	337us-gaap_Revenues / us-gaap_StatementGeographicalAxis = us-gaap_AllOtherSegmentsMember
Total Non-U.S. Locations [Member]
Concentration Risk [Line Items]
Revenues	30,998us-gaap_Revenues / us-gaap_StatementGeographicalAxis = us-gaap_NonUsMember	37,672us-gaap_Revenues / us-gaap_StatementGeographicalAxis = us-gaap_NonUsMember
UNITED STATES
Concentration Risk [Line Items]
Revenues	$ 225us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_US		$ 167us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_US

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- 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=26872669&loc=d3e20235-122688

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