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The percentage of interest of convertible preferred stock for under the cost method of accounting.

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The range of exercise prices of common stock that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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Represents the total number of warrants issued with promissory notes during the period.

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Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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Exercise price per share or per unit of warrants or rights outstanding.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Amount of interest capitalized during the period.

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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Amount of the effect of a change in accounting principle on operating profit or loss.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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The amount of accumulated depreciation, by major property class, recorded on property subject to or available for lease as of the balance sheet date.

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ACCOUNTING POLICIES (Details Textual) - USD ($)	12 Months Ended
ACCOUNTING POLICIES (Details Textual) - USD ($)	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Jun. 30, 2015
Accounting Policies [Line Items]
Interest Costs Capitalized	$ 138,000	$ 443,000	$ 431,000
Property Subject to or Available for Operating Lease, Net, Total	95,923,000	96,270,000
Property Subject to or Available for Operating Lease, Accumulated Depreciation	$ 51,403,000	$ 53,306,000
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	14,000	581,000	614,000
Stock Options Exercise Price	$ 3.90
Warrants Issued With Promissory Notes During The Period			200,000
Class of Warrant or Right, Exercise Price of Warrants or Rights		$ 2.20	$ 2.20
Advertising Expense	$ 140,000	$ 279,000	$ 115,000
Investments, Fair Value Disclosure, Total	$ 0
Sales Revenue, Net [Member]
Accounting Policies [Line Items]
Concentration Risk, Percentage	100.00%	100.00%	100.00%
Customer One [Member] \| Sales Revenue, Net [Member]
Accounting Policies [Line Items]
Concentration Risk, Percentage	21.00%	10.00%	10.00%
Restricted Stock Units (RSUs) [Member]
Accounting Policies [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	4,000	4,000	3,000
Accounting Standards Update 2016-18 [Member] \| Reclassification of Restricted Cash [Member]
Accounting Policies [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Operating Results	$ 100,000	$ 200,000
PBRT [Member]
Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	20 years
Mevion Medical Systems Inc [Member]
Accounting Policies [Line Items]
Cost Method Investment Interest Percentage	0.46%
Investments, Fair Value Disclosure, Total	$ 0	$ 579,000	$ 579,000	$ 600,000
Maximum [Member]
Accounting Policies [Line Items]
Stock Options Exercise Price		$ 3.15	$ 3.15
Maximum [Member] \| Medical and Office equipment [Member]
Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	10 years
Minimum [Member]
Accounting Policies [Line Items]
Stock Options Exercise Price		$ 2.43	$ 2.05
Minimum [Member] \| Customer Two [Member] \| Accounts Receivable [Member]
Accounting Policies [Line Items]
Concentration Risk, Percentage	10.00%	10.00%
Minimum [Member] \| Customer Three [Member] \| Accounts Receivable [Member]
Accounting Policies [Line Items]
Concentration Risk, Percentage	10.00%	10.00%
Minimum [Member] \| Medical and Office equipment [Member]
Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	3 years