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Investment in Equity Securities (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Aug. 04, 2015
Dec. 31, 2014
Schedule of Cost-method Investments [Line Items]            
Equity Method Investments $ 600,000   $ 600,000     $ 2,709,000
Non Refundable Deposits 5,000,000   5,000,000      
Other than Temporary Impairment Losses, Investments 2,114,000 $ 0 2,114,000 $ 0    
Valuation Allowance 0   0      
Subsequent Event [Member]            
Schedule of Cost-method Investments [Line Items]            
Equity Method Investment, Ownership Percentage         0.56%  
Mevion Medical Systems Inc [Member]            
Schedule of Cost-method Investments [Line Items]            
Equity Method Investments 600,000   600,000     $ 2,709,000
Investments, Fair Value Disclosure 600,000   600,000      
Other than Temporary Impairment Losses, Investments     2,114,000      
Mevion Medical Systems Inc [Member] | P WERM [Member]            
Schedule of Cost-method Investments [Line Items]            
Investments, Fair Value Disclosure $ 600,000   $ 600,000      
Investor [Member] | Subsequent Event [Member]            
Schedule of Cost-method Investments [Line Items]            
Equity Method Investments         $ 200,000,000