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Property and Equipment
3 Months Ended
Mar. 31, 2021
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 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 March 31, 2021 and December 31, 2020:
March 31,December 31,
20212020
Medical equipment and facilities$70,718,000 $75,657,000 
Office equipment394,000 330,000 
Construction in progress1,178,000 170,000 
72,290,000 76,157,000 
Accumulated depreciation(41,944,000)(45,739,000)
Net property and equipment$30,346,000 $30,418,000 
As of March 31, 2021, approximately $3,064,000 of the net property and equipment balance is outside of the United States.