PROPERTY AND EQUIPMENT (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 100,157,000	$ 104,880,000
Accumulated depreciation	(51,666,000)	(53,549,000)
Net property and equipment	48,491,000	51,331,000
Medical equipment and facilities [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	95,923,000	96,270,000
Accumulated depreciation	(16,777,000)	(16,642,000)
Office equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	576,000	537,000
Deposits and construction in progress [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	1,658,000	6,073,000
Deposits towards purchase of proton beam systems [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 2,000,000	$ 2,000,000