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CASH, CASH EQUIVALENTS AND INVESTMENTS (Details) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 0 Months Ended
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Jun. 30, 2014
Certificates of Deposit [Member]
Dec. 31, 2013
Certificates of Deposit [Member]
Jun. 30, 2014
Corporate Debt Securities [Member]
Dec. 31, 2013
Corporate Debt Securities [Member]
Jun. 30, 2014
US Treasury and Government [Member]
Dec. 31, 2013
US Treasury and Government [Member]
Jun. 30, 2014
Convertible notes [Member]
Dec. 31, 2013
Convertible notes [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       $ 10,985 $ 11,358                
Cash equivalents, Unrealized Gains       7 2                
Cash Equivalents, Gross Unrealized Losses       (11) (16)                
Cash and Cash Equivalents, Fair Value Disclosure       10,981 11,344                
Available-for-sale Debt Securities, Amortized Cost Basis   4,000       203,841 190,738 2,998 3,074 0 4,300 300  
Available-for-sale securities, Unrealized Gains           40 33 0 0 0 0    
Available-for-sale Securities           (6) (48) (1) 0 0 0    
Available-for-sale Securities, Fair Value Disclosure           203,875 190,723 2,997 3,074 0 4,300    
Investments, Amortized Cost Basis 217,824   209,470                    
Investments, Gross Unrealized Gains 47   35                    
Investments, Gross Unrealized Losses (18)   (64)                    
Investments $ 217,853   $ 209,441                    
Convertible promissory note stated interest rate                       5.00% 3.00%