Investment in Sublease (Details)	12 Months Ended
	Dec. 31, 2018 USD ($) Installment	Oct. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)
Balance Sheet Disclosures [Abstract]
Sales price	$ 2,249,000		$ 2,447,000
Less: Assets Derecognized [Abstract]
Gamma knife			(3,349,000)
Leasehold improvements			(898,000)
Assets derecognized			(4,247,000)
Add: Liabilities Derecognized [Abstract]
Deferred revenue			600,000
Asset retirement obligations			537,000
Liabilities derecognized			1,137,000
Loss on Derecognition	(663,000)
Future Minimum Lease Payments [Abstract]
2019	960,000
2020	960,000
2021	540,000
Future minimum lease payments to be received	2,460,000
Less interest	(211,000)
Present value of net minimum obligation	$ 2,249,000		$ 2,447,000
Gamma Knife Cobalt Reload [Member]
Capital Leases of Lessee [Abstract]
Monthly lease payment		$ 30,000
ICON Imaging Technology [Member]
Capital Leases of Lessee [Abstract]
Monthly lease payment					$ 20,000
NYU [Member]
Capital Leases of Lessee [Abstract]
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
NYU [Member] | Gamma Knife Cobalt Reload [Member]
Capital Leases of Lessee [Abstract]
Monthly lease payment	$ 50,000
Cobalt reload cost	1,503,000
NYU [Member] | ICON Imaging Technology [Member]
Capital Leases of Lessee [Abstract]
Monthly lease payment	30,000
Final lease payment amount	350,000
Total final lease payment	$ 380,000