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RELATED PARTY TRANSACTIONS (Details Textual)	12 Months Ended
	Dec. 31, 2018 USD ($)
Mevion Medical Systems Inc [Member]
Related Party Transaction [Line Items]
Retainage Deposit	$ 2,250,000
Cost of Property Repairs and Maintenance	$ 977,000
GKF Subsidiary [Member]
Related Party Transaction [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent	81.00%
U.S. Subsidiary Of Elekta [Member]
Related Party Transaction [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent	19.00%

X

- Definition

The aggregate costs of keeping the property in good condition but that do not appreciably prolong the life or increase the value of the property.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.2)
-URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227

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- Definition

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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- Definition

The amount of assets, typically cash, provided to suppliers of goods in advance of receipt and acceptance, or services (such as research facilities, lawyers or consultants), which is held by such parties until the entity either effects full payment (including applying the retainer) or obtains release from liability.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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