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Basis of Presentation (Details Textual) - USD ($)			3 Months Ended		9 Months Ended
	Aug. 13, 2016	Jan. 14, 2016	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Proceeds from Long-term Capital Lease Obligations					$ 1,137,000	$ 0
Payments to Acquire Property, Plant, and Equipment, Total					1,050,000	1,517,000
Loss on early extinguishment of debt			$ 0	$ 0	(108,000)	$ 0
Lease Expiration Period	7 years
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		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		$ 8,400,000
Repayments of Notes Payable		1,000,000
Purchase Commitment, Remaining Minimum Amount Committed		7,300,000
Payments to Acquire Property, Plant, and Equipment, Total		$ 1,137,000
PBRT [Member]
Property, Plant and Equipment, Useful Life					20 years
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%

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