SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $)			0 Months Ended				12 Months Ended						0 Months Ended		12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Jul. 13, 2012 Plextronics, Inc. [Member]	Dec. 31, 2013 Certificates of deposit [Member]	Dec. 31, 2012 Certificates of deposit [Member]	Dec. 31, 2012 Commercial paper [Member]	Dec. 31, 2013 Corporate bonds [Member]	Dec. 31, 2012 Corporate bonds [Member]	Dec. 31, 2013 U.S. Government bonds [Member]	Dec. 31, 2012 U.S. Government bonds [Member]	Dec. 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]	Dec. 31, 2013 Other Capitalized Property Plant and Equipment [Member]	Dec. 31, 2012 Other Capitalized Property Plant and Equipment [Member]	Dec. 31, 2011 Other Capitalized Property Plant and Equipment [Member]	Dec. 31, 2013 Fair value of stock warrant liability reclassified to shareholders' equity upon exercise [Member]	Dec. 31, 2012 Fair value of stock warrant liability reclassified to shareholders' equity upon exercise [Member]	Dec. 31, 2011 Fair value of stock warrant liability reclassified to shareholders' equity upon exercise [Member]
Schedule of Available-for-sale Securities [Line Items]
Other non-cash activities															$ 420,000	$ 165,000	$ 0	$ 0	$ 0	$ 14,850,000
Cash equivalents, Amortized Cost				11,358,000	7,562,000	2,997,000
Cash equivalents, Unrealized Gains				2,000	3,000	0
Cash equivalents, Unrealized Losses				(16,000)	(5,000)	0
Cash equivalents, Aggregate Fair Market Value				11,344,000	7,560,000	2,997,000
Available-for-sale debt securities, Amortized Cost	4,000,000						190,738,000	141,349,000	3,074,000	3,098,000	4,300,000	4,300,000	4,000,000	300,000
Available-for-sale securities, Unrealized Gains							33,000	9,000	0	0	0	0
Available-for-sale securities, Unrealized Losses							(48,000)	(25,000)	0	0	0	0
Available-for-sale Securities, Fair Value Disclosure							190,723,000	141,333,000	3,074,000	3,098,000	4,300,000	4,300,000
Short-term investments, Amortized Cost	209,470,000	159,306,000
Short-term investments, Unrealized Gains	35,000	12,000
Short-term investments, Unrealized Losses	(64,000)	(30,000)
Investments	$ 209,441,000	$ 159,288,000
Joint development, term of agreement (in years)			3 years
Convertible promissory note stated interest rate													3.00%	5.00%