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Basis of Presentation (Details Textual) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jan. 14, 2016
Jun. 30, 2016
Dec. 31, 2015
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Proceeds from Long-term Capital Lease Obligations         $ 1,137,000 $ 0  
Debt obligations, Carrying Value   $ 7,588,000 $ 9,597,000   7,588,000   $ 9,597,000
Payments to Acquire Property, Plant, and Equipment, Total         575,000 1,344,000  
Loss on early extinguishment of debt   0   $ 0 (108,000) 0  
Other than Temporary Impairment Losses, Investments   0   2,114,000 $ 0 2,114,000  
Property, Plant and Equipment, Useful Life         10 years    
Equity Method Investment, Other than Temporary Impairment     26,000        
Accounting Standards Update 2015-03 [Member]              
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets   67,000 72,000   $ 67,000   72,000
Notes Payable [Member]              
Loss on early extinguishment of debt         (108,000)    
Debt Instrument, Face Amount   145,000     145,000    
Unamortized discount on Notes   80,000     80,000    
Deferred fees from issuance of Note         28,000    
Mevion Medical Systems Inc [Member]              
Proceeds from Long-term Capital Lease Obligations $ 8,200,000            
Debt obligations, Carrying Value 8,400,000            
Repayments of Notes Payable 1,000,000            
Purchase Commitment, Remaining Minimum Amount Committed 7,100,000            
Payments to Acquire Property, Plant, and Equipment, Total $ 1,137,000            
Investments, Fair Value Disclosure, Total   $ 579,000 $ 579,000 $ 600,000 $ 579,000 600,000 579,000
Other than Temporary Impairment Losses, Investments           $ 2,114,000 $ 2,140,000
OR21 LLC [Member]              
Equity Method Investment, Ownership Percentage   50.00%     50.00%    
Architectural Design Company [Member]              
Equity Method Investment, Ownership Percentage   50.00%     50.00%