Present value of minimum lease payments for capital leases net of executory costs, including amounts paid by the lessee to the lessor for insurance, maintenance and taxes.

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-SubTopic 30
-Section 50
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-Subparagraph (b)
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- Definition

The net investment in sales type leases as of the balance sheet date consisting of: (a) minimum lease payments on sales type leases and (b) unguaranteed residual value; less: (i) executory costs, (ii) unearned income, and (iii) the accumulated allowance for uncollectible minimum lease payments.

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- Definition

The total amount of lease revenue recognized for the period for which the lessee was obligated under leasing arrangements regardless of any other events or conditions. This amount excludes contingent revenue and sublease revenue.

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-Topic 840
-SubTopic 20
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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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-Topic 606
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- Definition

Amount of transaction price allocated to performance obligation that has not been recognized as revenue.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
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- Definition

Refers to the amount of the final future minimum payment due at the end of a capital lease.

+ References

No definition available.

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- Definition

Amount of periodic minimum lease payments to be received by the lessor for capital leases.

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No definition available.

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Refers to then number of installment payments to be paid monthly over time related to a lease agreement.

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No definition available.

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The Company and its Significant Accounting Policies, Revenue Recognition (Details)	1 Months Ended	12 Months Ended
	Aug. 31, 2016 USD ($)	Dec. 31, 2018 USD ($) Installment	Dec. 31, 2017 USD ($)	Oct. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)
Revenue recognition [Abstract]
Present value of minimum lease payments		$ 2,249,000			$ 2,447,000
Maintenance services revenue		$ 3,424,000	$ 3,414,000
Gamma Knife Cobalt Reload [Member]
Revenue recognition [Abstract]
Monthly lease payment				$ 30,000
ICON Imaging Technology [Member]
Revenue recognition [Abstract]
Monthly lease payment							$ 20,000
NYU [Member]
Revenue recognition [Abstract]
Minimum monthly operating lease payment	$ 30,000
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
Present value of minimum lease payments					$ 2,447,000
Maintenance services revenue		$ 316,000	$ 264,000
Revenue, expected to recognize for remaining agreement period		316,000
NYU [Member] \| Gamma Knife Cobalt Reload [Member]
Revenue recognition [Abstract]
Monthly lease payment		50,000
NYU [Member] \| ICON Imaging Technology [Member]
Revenue recognition [Abstract]
Monthly lease payment		30,000
Final lease payment amount		$ 350,000