CASH, CASH EQUIVALENTS AND INVESTMENTS (Details) (USD $) In Thousands, unless otherwise specified						9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	0 Months Ended
	Sep. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2014 Certificates of Deposit [Member]	Dec. 31, 2013 Certificates of Deposit [Member]	Sep. 30, 2014 Corporate Debt Securities [Member]	Dec. 31, 2013 Corporate Debt Securities [Member]	Sep. 30, 2014 US Treasury and Government [Member]	Dec. 31, 2013 US Treasury and Government [Member]	Sep. 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				$ 10,785	$ 11,358
Cash equivalents, Unrealized Gains				5	2
Cash Equivalents, Gross Unrealized Losses				(10)	(16)
Cash and Cash Equivalents, Fair Value Disclosure				10,780	11,344
Available-for-sale Debt Securities, Amortized Cost Basis		4,000				216,788	190,738	5,999	3,074	0	4,300	300
Available-for-sale securities, Unrealized Gains						23	33	0	0	0	0
Available-for-sale Securities						(16)	(48)	0	0	0	0
Available-for-sale Securities, Fair Value Disclosure						216,795	190,723	5,999	3,074	0	4,300
Investments, Amortized Cost Basis	233,572		209,470
Investments, Gross Unrealized Gains	28		35
Investments, Gross Unrealized Losses	(26)		(64)
Investments	$ 233,574		$ 209,441
Convertible promissory note stated interest rate												5.00%	3.00%