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Property and Equipment | 9 Months Ended
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Sep. 30, 2020
Property, Plant and Equipment [Abstract] |
Property and Equipment | Property and Equipment Property and equipment are stated at cost less accumulated depreciation. Depreciation for Gamma Knife units, Image Guided Radiation Therapy (“IGRT”) equipment, and other equipment is determined using the straight-line method over the estimated useful lives of the assets, which for medical and office equipment is generally 3 – 10 years, and after accounting for salvage value on the equipment where indicated. Salvage value is based on the estimated fair value of the equipment at the end of its useful life. Depreciation for PBRT equipment is determined using the modified units of production method, which is a function of both time and usage of the equipment. This depreciation method allocates costs considering the projected volume of usage through the useful life of the PBRT unit, which has been estimated at 20 years. The estimated useful life of the PBRT unit is consistent with the estimated economic life of 20 years. The following table summarizes property and equipment as of September 30, 2020 and December 31, 2019:
|  | September 30, |  | December 31,
|  | 2020 |  | 2019
Medical equipment and facilities |  | $ | 88,729,000 |  |  | $ | 92,132,000 |
Office equipment |  | 339,000 |  |  | 594,000 |
Deposits and construction in progress |  | 2,411,000 |  |  | 1,965,000 |
Deposits towards purchase of proton beam systems |  | 2,250,000 |  |  | 2,250,000 |
|  | 93,729,000 |  |  | 96,941,000 |
Accumulated depreciation |  | (54,943,000) |  |  | (55,461,000) |
Net property and equipment |  | $ | 38,786,000 |  |  | $ | 41,480,000 |
As of September 30, 2020, approximately $3,343,000 of the net property and equipment balance is outside of the United States. As of September 30, 2020, the Company has two idle Gamma Knife units with a cumulative net book value of $943,000. There are currently no commitments to place into service or trade in these units during 2020.

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=120429125&loc=SL120174063-112916 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99779-112916 + Details
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