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PROPERTY AND EQUIPMENT (Details) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Gross | $ 100,702,000 | $ 100,157,000
Accumulated depreciation | (54,008,000) | (51,666,000)
Net property and equipment | 46,694,000 | 48,491,000
Medical equipment and facilities [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Gross | 94,031,000 | 95,923,000
Accumulated depreciation | (20,292,000) | (16,777,000)
Office equipment [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Gross | 589,000 | 576,000
Deposits and construction in progress [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Gross | 3,832,000 | 1,658,000
Deposits towards purchase of proton beam systems [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Gross | $ 2,250,000 | $ 2,000,000

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- Definition The total charge for the use of long-lived depreciable assets subject to a lease meeting the criteria for capitalization. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 2) -URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84164758&loc=d3e45014-112735 + Details
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