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COMMITMENTS AND CONTINGENCIES (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2017	Aug. 04, 2017
Gamma Knife Perfexion System [Member]
Commitments And Contingencies [Line Items]
Long-term Purchase Commitment, Amount	$ 1,500,000
Mevion Medical Systems Inc [Member]
Commitments And Contingencies [Line Items]
Long-term Purchase Commitment, Amount	25,800,000
Long-term Purchase Commitment, Deposits for Future Purchase	$ 2,000,000
Prepaid Contract Expenses		$ 1,000,000

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The minimum amount the entity agreed to spend under the long-term purchase commitment.

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