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ACCOUNTING POLICIES (Details Textual) - USD ($) | 12 Months Ended |
--- | --- | ---
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 |  |  |

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