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Basis of Presentation (Details Textual) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2016	Aug. 04, 2017
Basis Of Presentation [Line Items]
Warrants Issued With cashless exercise during period	25,000
Class of Warrant or Right, Outstanding			100,000
Class of Warrant or Right, Exercise Price of Warrants or Rights			$ 2.20
Accounting Standards Update 2016-18 [Member] | Reclassification of Restricted Cash [Member]
Basis Of Presentation [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Operating Results	$ 350,000	$ 250,000
Common Stock [Member]
Basis Of Presentation [Line Items]
Stock Issued During Period, Shares, Warrants Exercised			100,000
Notes Payable [Member]
Basis Of Presentation [Line Items]
Warrants Issued With cashless exercise during period	50,000
OR21 LLC [Member]
Basis Of Presentation [Line Items]
Equity Method Investment, Ownership Percentage	50.00%
Architectural Design Company [Member]
Basis Of Presentation [Line Items]
Equity Method Investment, Ownership Percentage	50.00%
Mevion Medical Systems Inc [Member]
Basis Of Presentation [Line Items]
Prepaid Contract Expenses				$ 1,000,000

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