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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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