The Company has elected not to record operating right-of-use assets or operating lease liabilities on its consolidated balance sheet for leases having a minimum term of 12 months or less. Such leases are expensed on a straight-line basis over the lease term. Variable lease payments are excluded from the measurement of operating right-of-use assets and operating lease liabilities and are recognized in the period in which the obligation for those payments is incurred. As of June 30, 2021, the Company has two operating right-of-use assets related to leased facilities in Austin, Texas and Cocoa Beach, Florida.

Maturities of the operating lease liabilities as of June 30, 2021 were as follows: (in thousands):

For fiscal years ending September 30,
2021 (remainder)	$	69
2022		262
2023		270
2024		278
2025		186
Thereafter		356
Future minimum lease payments		1,421
Less interest		127
Present value of minimum lease payments		1,294
Less current portion		(221	)
Long-term portion	$	1,073

Lease costs recognized in the consolidated statements of operations for the three and nine months ended June 30, 2021 and 2020 is as follows (in thousands):

	Three Months Ended				Nine Months Ended
	June 30, 2021		June 30, 2020		June 30, 2021		June 30, 2020
Right-of-use operating lease costs	$	67	$	38	$	178	$	113
Short-term lease costs		52		78		192		229
Total	$	119	$	116	$	370	$	342

Right-of-use operating lease costs and short-term lease costs are included as a component of total operating expenses.

	Nine Months Ended
	June 30, 2021			June 30, 2020
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$	142		$	123
Operating lease assets obtained in exchange for new lease liabilities		1,336			219

Weighted average remaining lease term	5.8 years			0.8 year
Weighted average discount rate		3.25	%		5.00	%

The discount rate used on the operating right-of-use assets represented the Company’s incremental borrowing rate at lease inception.

The Company leases equipment to customers primarily for terms of six months or less. The majority of the Company’s rental revenue is generated from its marine-based wireless seismic data acquisition system.

All of the Company’s leasing arrangements as lessor are classified as operating leases, except for one sales-type lease. See Note 5 for more information on the Company’s sales-type lease.

The Company regularly evaluates the collectability of its lease receivables on a lease by lease basis. The evaluation primarily consists of reviewing past due account balances and other factors such as the credit quality of the customer, historical trends of the customer and current economic conditions. The Company suspends revenue recognition when the collectability of amounts due are no longer probable and concurrently records a direct write-off of the lease receivable to rental revenue and limits future rental revenue recognition to cash received. As of June 30, 2021, the Company’s trade accounts receivables included lease receivables of $4.8 million.

Rental revenue for the three and nine months ended June 30, 2021 was $5.4 million and $9.4 million, respectively. Rental revenue for the three and nine months ended June 30, 2020 was $15.7 million and $40.7 million, respectively.

At June 30, 2021, future minimum lease obligations due from the Company’s leasing customers on operating leases (all in fiscal year 2021) were $6.4 million.

	June 30, 2021			September 30, 2020
Rental equipment, primarily wireless recording equipment	$	95,665		$	114,783
Accumulated depreciation and impairment		(53,803	)		(60,466	)
	$	41,862		$	54,317