Gamma Knife at NYU Medical Center (Details)				1 Months Ended			6 Months Ended
	Nov. 01, 2014 USD ($)	Sep. 01, 2014 USD ($)	Oct. 31, 2012 USD ($)	Sep. 30, 2017 USD ($)	Jul. 31, 2016 USD ($)	Apr. 30, 2016 USD ($)	Jun. 30, 2018 USD ($) Installment
Perfexion Gamma Knife [Member]
Gamma Knives at NYU Medical Center [Abstract]
Estimated cobalt reload cost							$ 1,100,000
Maximum estimated site work cost							1,088,000
Adjustment to estimated site work cost							$ 300,000
NYU [Member]
Gamma Knives at NYU Medical Center [Abstract]
Monthly lease payment				$ 50,000
Installation cost of new ICON imaging technology for gamma knife equipment				2,400,000
Number of monthly installments | Installment							41
Final lease payment amount, partial month				350,000
Estimated fair value of equipment				$ 2,570,000
NYU [Member] | Revenue [Member]
Gamma Knives at NYU Medical Center [Abstract]
Percentage of revenue							90.00%
NYU [Member] | Perfexion Gamma Knife [Member]
Gamma Knives at NYU Medical Center [Abstract]
Terms of agreement with NYU							12 years
Emergency removal cost			$ 525,000
Insurance coverage			$ 930,000
NYU [Member] | Perfexion Gamma Knife, Purchase and Replacement [Member]
Gamma Knives at NYU Medical Center [Abstract]
Term of lease agreement with NYC							6 years
Operating lease amount		$ 4,700,000
Lease payment		78,000
Interest on lease payment		$ 18,000
NYU [Member] | Perfexion Gamma Knife, New Installation and Related Construction Costs [Member]
Gamma Knives at NYU Medical Center [Abstract]
Term of lease agreement with NYC							2 years
Operating lease amount	$ 250,000
Lease payment	$ 12,000
NYU [Member] | ICON Imaging Technology [Member]
Gamma Knives at NYU Medical Center [Abstract]
Operating lease amount						$ 879,000
Cost of new equipment installed						$ 816,000
Interest rate on lease						4.45%
Installation costs of technology						$ 63,000
Monthly lease payment						20,000
Monthly maintenance agreement cost						$ 6,000
Increase in monthly lease agreement amount received					$ 30,000