Gain (loss) related to the termination of a contract between the parties. The termination may be due to many causes including early termination of a lease by a lessee, a breach of contract by one party, or a failure to perform.

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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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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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Present value of lease payments not yet received by lessor and amount expected to be derived from underlying asset, following end of lease term guaranteed by lessee or other third party unrelated to lessor, from sales-type lease.

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Amount, before allowance for credit loss, of net investment in sales-type lease.

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

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

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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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The Company and its Significant Accounting Policies, Revenue Recognition (Details)	1 Months Ended	12 Months Ended
	Aug. 31, 2016 USD ($)	Dec. 31, 2021 USD ($) Installment	Dec. 31, 2020 USD ($)	Dec. 31, 2018 USD ($)	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						$ 2,447,000
Maintenance services revenue		$ 1,061,000	$ 3,173,000
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
Gain on termination of contract		$ 100,000
Maintenance services revenue		$ 79,000	$ 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