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CONVERTIBLE PREFERRED STOCK INVESTMENT (Details Textual) (USD $)	12 Months Ended					0 Months Ended		1 Months Ended
	Dec. 31, 2012	Jan. 31, 2012	Dec. 31, 2011	Sep. 05, 2007	Apr. 10, 2006	Sep. 05, 2007 Series B Convertible Preferred Stock [Member]	Apr. 10, 2006 Series B Convertible Preferred Stock [Member]	Jan. 31, 2012 Mevion Medical Systems [Member]	Oct. 31, 2008 Mevion Medical Systems [Member]
Cost Method Investments	$ 2,687,000		$ 2,656,000	$ 617,000	$ 2,000,000			$ 45,000,000
Conversion of Stock, Shares Issued						588,000	2,353,000
Proceeds from Sale of Other Investments									65,000,000
Stockholders' Equity, Reverse Stock Split	In mid-2011, Mevion performed a reverse stock split of all shares in which 100 shares were converted to one share.
Initially Funded Percentage								55.00%
Remaining Funded Percentage								45.00%
Additional Cost Method Investments		70,000
Investment Percentage in Common Stock	1.00%
Unrealized Gain (Loss) on Investments	$ (1,300,000)

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