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RELATED PARTY TRANSACTIONS	12 Months Ended
RELATED PARTY TRANSACTIONS	Dec. 31, 2019
Related Party Transactions [Abstract]
RELATED PARTY TRANSACTIONS	RELATED PARTY TRANSACTIONS The Company’s Gamma Knife business is operated through its 81% indirect interest in its GKF subsidiary. The remaining 19% of GKF is owned by a wholly owned U.S. subsidiary of Elekta, which is the manufacturer of the Gamma Knife. Since the Company purchases its Gamma Knife units from Elekta, there are significant related party transactions with Elekta such as equipment purchases, commitments to purchase equipment, deposits for such equipment purchases, and costs to maintain the equipment. The Company believes that all its transactions with Elekta are arm’s-length transactions. At December 31, 2019, the Company had commitments to purchase five Cobalt-60 reloads, install five Icon upgrades and service the related equipment, as discussed in Note 12 – Commitments and Contingencies. The Company purchased one MEVION S250 PBRT machine from Mevion, and has $2,250,000 in non-refundable deposits towards the purchase of two additional MEVION S250i machines. The Company also contracted with Mevion to repair the damaged PBRT unit and incurred repair costs of approximately $977,000, which is included in the Company’s consolidated balance sheet for the year ended December 31, 2018. The Company believes all of its transactions with Mevion were arm’s-length transactions. See Note 4 – Investment in Equity Securities for additional information.