Agreement with New York University on Behalf of New York University Medical Center (Details)	1 Months Ended		12 Months Ended
	Jul. 31, 2018 USD ($)	Sep. 30, 2017 USD ($)	Dec. 31, 2018 USD ($) Installment	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($) Party	Dec. 31, 2009 USD ($)	Dec. 31, 2008 USD ($)	Oct. 31, 2018 USD ($)	Jun. 30, 2017 USD ($)	Apr. 30, 2016 USD ($)	Dec. 31, 2014 USD ($)
NYU Revenue Recognition [Abstract]
Maintenance services revenue			$ 3,424,000	$ 3,414,000
NYU Accounts Receivable and Contract Balances [Abstract]
Accounts receivable			318,000	767,000
Perfexion Gamma Knife [Member]
Agreement With New York University [Abstract]
Capital lease obligation			$ 2,387,000	2,638,000
Maximum estimated site work cost		$ 1,088,000
ICON Imaging Technology [Member]
Agreement With New York University [Abstract]
Capital lease obligation					$ 879,000
Gamma Knife Cobalt Reload [Member]
Agreement With New York University [Abstract]
Capital lease obligation								$ 833,000
NYU [Member]
Agreement With New York University [Abstract]
Term of lease agreement with NYC			7 years
Option to extend agreement term			3 years
Purchase price of gamma knife equipment		2,400,000
Number of monthly installments | Installment			41
Monthly lease payment		50,000
Final lease payment amount		$ 350,000
Estimated fair value of equipment									$ 2,570,000
NYU Revenue Recognition [Abstract]
Maintenance services revenue			$ 3,424,000	3,414,000
Lease Income			3,108,000	3,150,000
NYU [Member] | Maintenance [Member]
NYU Revenue Recognition [Abstract]
Maintenance services revenue			$ 316,000	$ 264,000
NYU [Member] | Perfexion Gamma Knife [Member]
Agreement With New York University [Abstract]
Term of lease agreement with NYC			7 years
Extension of agreement			12 years
Cost of new equipment installed						$ 3,742,000	$ 3,742,000
NYU [Member] | Perfexion Gamma Knife, Purchase and Replacement [Member]
Agreement With New York University [Abstract]
Term of lease agreement with NYC			6 years
Capital lease obligation										$ 879,000
Operating lease amount											$ 4,700,000
NYU [Member] | Perfexion Gamma Knife, New Installation and Related Construction Costs [Member]
Agreement With New York University [Abstract]
Term of lease agreement with NYC			2 years
Operating lease amount											$ 250,000
NYU [Member] | ICON Imaging Technology [Member]
Agreement With New York University [Abstract]
Term of lease agreement with NYC			4 years
Cost of new equipment installed					816,000
Capital lease obligation					879,000
Monthly maintenance agreement cost					$ 6,000
Number of parties agreed to receive payment | Party					2
Increase in monthly lease agreement amount received					$ 30,000
Final lease payment amount			$ 350,000
NYU [Member] | Gamma Knife Cobalt Reload [Member]
Agreement With New York University [Abstract]
Cost of new equipment installed	$ 925,000
Capital lease obligation	833,000							$ 833,000
Installation costs of technology	$ 578,000
Cobalt reload cost			$ 1,503,000