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OPERATING LEASES
 12 Months Ended
Dec. 31, 2020
Leases, Operating [Abstract]  
OPERATING LEASES OPERATING LEASES
The Company leases office space and equipment under operating leases expiring at various dates through 2021 and 2024. On August 13, 2016, the Company entered into a 7 year operating lease for an office space located in San Francisco, CA. The Company also owns and operates a stand-alone Gamma Knife facility in Lima, Peru where it leases approximately 1,600 square feet for approximately $7,800 per month with a lease expiration date in January 2024.
Future minimum payments under non-cancelable operating leases having initial terms of more than one year consisted of the following:

Year ending December 31,
2021$350,000 
2022355,000 
2023259,000 
20248,000 
$972,000 
Payments for repair and maintenance agreements incorporated in operating lease agreements are not included in the future minimum operating lease payments shown above.
Net rent expense was $404,000 and $380,000 for the years ended December 31, 2020 and 2019, respectively, and includes the above operating leases as well as month-to-month rental and certain executory costs.