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CASH, CASH EQUIVALENTS AND INVESTMENTS (Details) (USD $) |  |  |  | 0 Months Ended |  |  |  |  |  |  |  |  |  |  | 0 Months Ended
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Mar. 31, 2013 | Dec. 31, 2012 | Jul. 13, 2012 | Jul. 13, 2012 Plextronics, Inc. [Member] | Mar. 31, 2013 Certificates of deposit [Member] | Dec. 31, 2012 Certificates of deposit [Member] | Mar. 31, 2013 Commercial Paper [Member] | Dec. 31, 2012 Commercial Paper [Member] | Mar. 31, 2013 Corporate bonds [Member] | Dec. 31, 2012 Corporate bonds [Member] | Mar. 31, 2013 U.S. government bonds [Member] | Dec. 31, 2012 U.S. government bonds [Member] | Mar. 31, 2013 Convertible notes [Member] | Dec. 31, 2012 Convertible notes [Member] | Jul. 13, 2012 Convertible notes [Member] Plextronics, Inc. [Member] | Jul. 17, 2012 Convertible notes [Member] Private company [Member]
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortized Cost | $ 180,200,000 | $ 159,306,000 |  |  | $ 8,447,000 | $ 7,562,000 | $ 1,998,000 | $ 2,997,000 | $ 162,356,000 | $ 141,349,000 | $ 3,099,000 | $ 3,098,000 | $ 4,300,000 | $ 4,300,000 | $ 4,000,000 | $ 300,000
Unrealized Gains | 16,000 | 12,000 |  |  | 4,000 | 3,000 |  |  | 12,000 | 9,000 |  |  |  |  |  |
Unrealized Losses | (37,000) | (30,000) |  |  | (7,000) | (5,000) |  |  | (30,000) | (25,000) |  |  |  |  |  |
Aggregate Fair Market Value | 180,179,000 | 159,288,000 |  |  | 8,444,000 | 7,560,000 | 1,998,000 | 2,997,000 | 162,338,000 | 141,333,000 | 3,099,000 | 3,098,000 | 4,300,000 | 4,300,000 |  |
Joint development, term of agreement (in years) |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |
Joint development agreement, annual commitment |  |  | $ 1,000,000.0 | $ 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Convertible promissory note stated interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.00% | 5.00%

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