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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) | Jul. 17, 2012 | Jul. 13, 2012 | Dec. 31, 2015 | Dec. 31, 2014
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Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Short-term investments, Amortized Cost |  |  | $ 300,333,000 | $ 246,171,000
Short-term investments, Unrealized Gains |  |  | 4,000 | 18,000
Short-term investments, Unrealized Losses |  |  | (169,000) | (54,000)
Investments |  |  | 300,168,000 | 246,135,000
Plextronics, Inc. [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Joint development, term of agreement (in years) |  | 3 years |  |
Certificates of deposit [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale Securities, Amortized Cost Basis |  |  | 11,532,000 | 11,373,000
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax |  |  | 3,000 | 4,000
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax |  |  | (14,000) | (13,000)
Available-for-sale Securities, Fair Value Disclosure |  |  | 11,521,000 | 11,364,000
Corporate bonds [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale debt securities, Amortized Cost |  |  | 233,848,000 | 228,799,000
Available-for-sale debt securities, Unrealized Gains |  |  | 0 | 14,000
Available-for-sale debt securities, Unrealized Losses |  |  | 139,000 | 41,000
Available-for-sale Securities, Debt Securities |  |  | 233,709,000 | 228,772,000
U.S. Government bonds [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale debt securities, Amortized Cost |  |  | 54,953,000 | 5,999,000
Available-for-sale debt securities, Unrealized Gains |  |  | 1,000 | 0
Available-for-sale debt securities, Unrealized Losses |  |  | 16,000 | 0
Available-for-sale Securities, Debt Securities |  |  | $ 54,938,000 | $ 5,999,000
Convertible notes [Member] | Plextronics, Inc. [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale debt securities, Amortized Cost |  | $ 4,000,000 |  |
Convertible promissory note stated interest rate |  | 3.00% |  |
Convertible notes [Member] | Private Company [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale debt securities, Amortized Cost | $ 300,000 |  |  |
Convertible promissory note stated interest rate | 5.00% |  |  |

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