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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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