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INVESTMENT IN EQUITY SECURITIES (Details Textual) (USD $) | 12 Months Ended |  |  | 0 Months Ended | 1 Months Ended |  |  |
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Dec. 31, 2013 | Dec. 31, 2012 | Jan. 31, 2012 | Sep. 05, 2007 Series B Convertible Preferred Stock [Member] | Apr. 10, 2006 Series B Convertible Preferred Stock [Member] | Jan. 31, 2012 Mevion Medical Systems Inc [Member] | Oct. 31, 2008 Mevion Medical Systems Inc [Member] | Jun. 30, 2013 Mevion Medical Systems Inc [Member] | Sep. 05, 2007 Mevion Medical Systems Inc [Member] | Apr. 10, 2006 Mevion Medical Systems Inc [Member]
Schedule of Cost-method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Cost Method Investments | $ 2,701,000 | $ 2,687,000 |  |  |  | $ 45,000,000 |  | $ 55,000,000 | $ 617,000 | $ 2,000,000
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 | 0.77% |  |  |  |  |  |  |  |  |
Unrealized Gain on Investments | $ 2,400,000 |  |  |  |  |  |  |  |  |

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