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CASH, CASH EQUIVALENTS AND INVESTMENTS (Details) (USD $) In Thousands, unless otherwise specified |  |  | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended |  |  | 0 Months Ended
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Mar. 31, 2014 | Dec. 31, 2013 | Mar. 31, 2014 Corporate Debt Securities [Member] | Dec. 31, 2013 Corporate Debt Securities [Member] | Mar. 31, 2014 US Treasury and Government [Member] | Dec. 31, 2013 US Treasury and Government [Member] | Mar. 31, 2014 Convertible notes [Member] | Dec. 31, 2013 Convertible notes [Member] | Mar. 31, 2014 Certificates of Deposit [Member] | Dec. 31, 2013 Certificates of Deposit [Member] | Jul. 17, 2012 Private Company [Member] Convertible notes [Member] | Jul. 13, 2012 Plextronics, Inc. [Member] Convertible notes [Member]
Cash and Cash Equivalents [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cash Equivalents, at Carrying Value |  |  |  |  |  |  |  |  | $ 10,881 | $ 11,358 |  |
Cash equivalents, Unrealized Gains |  |  |  |  |  |  |  |  | 4 | 2 |  |
Cash Equivalents, Gross Unrealized Losses |  |  |  |  |  |  |  |  | (10) | (16) |  |
Cash and Cash Equivalents, Fair Value Disclosure |  |  |  |  |  |  |  |  | 10,875 | 11,344 |  |
Available-for-sale Debt Securities, Amortized Cost Basis | 4,000 |  | 218,771 | 190,738 | 4,075 | 3,074 | 300 | 4,300 |  |  | 300 |
Available-for-sale securities, Unrealized Gains |  |  | 37 | 33 | 0 | 0 | 0 | 0 |  |  |  |
Convertible promissory note stated interest rate |  |  |  |  |  |  |  |  |  |  | 5.00% | 3.00%
Available-for-sale Securities |  |  | (17) | (48) | 0 | 0 | 0 | 0 |  |  |  |
Available-for-sale Securities, Fair Value Disclosure |  |  | 218,791 | 190,723 | 4,075 | 3,074 | 300 | 4,300 |  |  |  |
Investments, Amortized Cost Basis | 234,027 | 209,470 |  |  |  |  |  |  |  |  |  |
Investments, Gross Unrealized Gains | 41 | 35 |  |  |  |  |  |  |  |  |  |
Investments, Gross Unrealized Losses | (27) | (64) |  |  |  |  |  |  |  |  |  |
Investments | $ 234,041 | $ 209,441 |  |  |  |  |  |  |  |  |  |

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- Definition The interest rate for investments that have an interest rate. For fixed rate investments, this indicates the fixed interest rate. If the investment has a variable interest rate, the rate stated here may be the rate that is currently relevant. In this case the "Investment, Interest Rate is Current Rate for Variable Rate Investment Flag", "Investment, Interest Rate is Discount Rate at Purchase Flag", "Investment, Interest Rate Reflects Current Yield Flag" should be used. If one of these flags are not appropriate to explain the interest rate that is indicated, then a new flag should be added or an explanation should be included in "Investment, Additional Information". + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 12 -Sentence Column A + Details
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- Definition This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References No definition available. + Details
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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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- Definition Amount of unrealized gain before deducting unrealized loss on investments in debt and equity securities classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition Amount of unrealized loss before deducting unrealized gain on investments in available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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- Definition Amount of short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Sum of the carrying amounts as of the balance sheet date of all investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(h)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph h -Article 7 + Details
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