CASH, CASH EQUIVALENTS AND INVESTMENTS (Details) (USD $) In Thousands, unless otherwise specified			3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended			0 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014 Corporate Debt Securities [Member]	Dec. 31, 2013 Corporate Debt Securities [Member]	Mar. 31, 2014 US Treasury and Government [Member]	Dec. 31, 2013 US Treasury and Government [Member]	Mar. 31, 2014 Convertible notes [Member]	Dec. 31, 2013 Convertible notes [Member]	Mar. 31, 2014 Certificates of Deposit [Member]	Dec. 31, 2013 Certificates of Deposit [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									$ 10,881	$ 11,358
Cash equivalents, Unrealized Gains									4	2
Cash Equivalents, Gross Unrealized Losses									(10)	(16)
Cash and Cash Equivalents, Fair Value Disclosure									10,875	11,344
Available-for-sale Debt Securities, Amortized Cost Basis	4,000		218,771	190,738	4,075	3,074	300	4,300			300
Available-for-sale securities, Unrealized Gains			37	33	0	0	0	0
Convertible promissory note stated interest rate											5.00%	3.00%
Available-for-sale Securities			(17)	(48)	0	0	0	0
Available-for-sale Securities, Fair Value Disclosure			218,791	190,723	4,075	3,074	300	4,300
Investments, Amortized Cost Basis	234,027	209,470
Investments, Gross Unrealized Gains	41	35
Investments, Gross Unrealized Losses	(27)	(64)
Investments	$ 234,041	$ 209,441