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OPERATING LEASES
 12 Months Ended
Dec. 31, 2019
Leases, Operating [Abstract]  
OPERATING LEASES OPERATING LEASES
The Company leases office space and equipment under operating leases expiring at various dates through 2020 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 has a satellite office in Fairfield, CA with a lease expiration date in April 2020. The Company also owns and operates a stand-alone Gamma Knife facility in Lima, Peru where it leases approximately 1,600 for approximately $5,000 per month with a lease expiration date in January 2024.
Future minimum payments under non-cancelable operating leases, net of expected sublease income, having initial terms of more than one year consisted of the following:
Year ending December 31,
2020$319,000  
2021312,000  
2022319,000  
2023225,000  
20245,000  
$1,180,000  
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 $380,000, $298,000, and $308,000 for the years ended December 31, 2019, 2018 and 2017, respectively, and includes the above operating leases as well as month-to-month rental and certain executory costs.