Obligations Under Capital Lease (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Oct. 31, 2018	Dec. 31, 2016	Dec. 31, 2014	Dec. 31, 2013	Mar. 31, 2009
Capital Lease [Abstract]
Lease amount for cost of construction	$ 0	$ 2,138,000
Depreciation and amortization expense	229,000	305,000
Obligation under capital leases [Abstract]
Less current portion	(1,399,000)	(972,000)
Capital lease obligations, noncurrent	$ 988,000	1,666,000
Perfexion Gamma Knife [Member]
Capital Lease [Abstract]
Equipment financed term	7 years
Capital lease asset under construction		5,182,000					$ 3,742,000
Monthly payments for capital leases						$ 78,000
Modified equipment capitalized cost under agreement						$ 4,700,000
Interest rate on lease						4.49%
Depreciation and amortization expense	$ 688,000	804,000
Obligation under capital leases [Abstract]
Capital leases - Gamma Knife	2,387,000	2,638,000
Less current portion	(1,399,000)	(972,000)
Capital lease obligations, noncurrent	988,000	1,666,000
Analysis of leased assets included in property and equipment [Abstract]
Capitalized costs		5,182,000					$ 3,742,000
Less - accumulated depreciation		(2,577,000)
Capitalized lease equipment and improvements-reported as property and equipment - net		$ 2,605,000
Future payment on equipment leases and loans [Abstract]
2019	1,499,000
2020	923,000
2021	90,000
Total	2,512,000
Less interest	(125,000)
Present value of net minimum obligation	$ 2,387,000
Perfexion Gamma Knife, New Installation and Related Construction Costs [Member]
Capital Lease [Abstract]
Equipment financed term	72 months
Perfexion Gamma Knife, Further Installation and Related Construction Costs [Member]
Capital Lease [Abstract]
Equipment financed term	24 months
Lease amount for cost of construction					$ 250,000
ICON Imaging Technology [Member]
Capital Lease [Abstract]
Equipment financed term	48 months
Monthly payments for capital leases				$ 20,000
Interest rate on lease				4.45%
Obligation under capital leases [Abstract]
Capital leases - Gamma Knife				$ 879,000
Gamma Knife, Cobalt Reload [Member]
Capital Lease [Abstract]
Equipment financed term	30 months
Monthly payments for capital leases			$ 30,000
Interest rate on lease			5.85%
Obligation under capital leases [Abstract]
Capital leases - Gamma Knife			$ 833,000