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