The Company leases approximately 37,729 rentable square feet of office and warehouse space from an unaffiliated third party for our corporate office, manufacturing, assembly, warehouse and shipping facility located at 7970 South Kyrene Road, Tempe, Arizona 85284. In addition, the Company leases approximately 5,131 rentable square feet of space for our machine shop located at 7910 South Kyrene Road, within the same business complex as our main office. The Company executed a lease amendment extending its existing office lease through April 2024. The Company’s lease agreements do not contain any residual value guarantees, restrictive covenants or variable lease payments. The Company has not entered into any financing leases.

In addition to base rent, the Company’s lease generally provides for additional payments for other charges, such as rental tax. The lease includes fixed rent escalations. The Company’s lease does not include an option to renew.

The Company determines if an arrangement is a lease at inception. Operating leases are recorded in operating lease right of use assets, net, operating lease liability – short term, and operating lease liability – long-term on its condensed balance sheet.

Operating lease assets represent the Company’s right to use an underlying asset for the lease term and lease liabilities represent its obligation to make lease payments arising from the lease. Operating lease assets and liabilities are recognized at the commencement date based on the present value of lease payments over the lease term. As the Company’s lease does not provide an implicit rate, the Company uses its incremental borrowing rate based on the information available at commencement date in determining the present value of lease payments. The incremental borrowing rate used at adoption was 4.5%. Significant judgement is required when determining the Company’s incremental borrowing rate. The Company uses the implicit rate when readily determinable. Lease expense for lease payments is recognized on a straight-line basis over the lease term.

Effective January 1, 2019, the Company obtained a right-of-use asset in exchange for a new operating lease liability in the amount of $1,721,380 and derecognized $46,523 deferred rent for an adjusted operating lease right-of-use asset in the net amount of $1,674,857.

The balance sheet classification of lease assets and liabilities as of June 30, 2021 was as follows:

Future minimum lease payments as of June 30, 2021 under non-cancelable operating leases are as follows:

The balance sheet classification of lease assets and liabilities as of December 31, 2020 was as follows:

Balance Sheet Classification	December 31, 2020
Assets
Operating lease right-of-use assets, January 1, 2020	$	1,390,873
Amortization for the year ended December 31, 2020		(296,346	)
Total operating lease right-of-use asset, December 31, 2020	$	1,094,527
Liabilities
Current
Operating lease liability, short-term	$	321,727
Non-current
Operating lease liability, long-term		853,155
Total lease liabilities	$	1,174,882

Future minimum lease payments as of December 31, 2020 under non-cancelable operating leases are as follows:


2021	$	368,060
2022		379,097
2023		390,562
2024		131,152
Total lease payments		1,268,871
Less: imputed interest		(93,989	)
Operating lease liability	$	1,174,882

Rent expense for the three months ended June 30, 2021 and 2020 was $115,140 and $135,079, respectively. Rent expense for the six months ended June 30, 2021 and 2020 was $258,897 and $268,080, respectively.