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CASH, CASH EQUIVALENTS AND INVESTMENTS (Details) (USD $)
 0 Months Ended 0 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Jul. 13, 2012
Jul. 13, 2012
Plextronics, Inc. [Member]
Jun. 30, 2013
Certificates of deposit [Member]
Dec. 31, 2012
Certificates of deposit [Member]
Jun. 30, 2013
Commercial Paper [Member]
Dec. 31, 2012
Commercial Paper [Member]
Jun. 30, 2013
Corporate bonds [Member]
Dec. 31, 2012
Corporate bonds [Member]
Jun. 30, 2013
U.S. government bonds [Member]
Dec. 31, 2012
U.S. government bonds [Member]
Jun. 30, 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 $ 169,746,000 $ 159,306,000     $ 9,117,000 $ 7,562,000 $ 2,000,000 $ 2,997,000 $ 151,255,000 $ 141,349,000 $ 3,074,000 $ 3,098,000 $ 4,300,000 $ 4,300,000 $ 4,000,000 $ 300,000
Unrealized Gains 41,000 12,000     3,000 3,000       38,000 9,000                
Unrealized Losses (23,000) (30,000)     (12,000) (5,000)       (9,000) (25,000) (2,000)             
Aggregate Fair Market Value 169,764,000 159,288,000     9,108,000 7,560,000 2,000,000 2,997,000 151,284,000 141,333,000 3,072,000 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%