7. Leases

12 Months Ended

Dec. 31, 2017

Leases [Abstract]

7. Leases

The Company leases approximately 54,000 square feet of industrial space in West Melbourne, Florida, under a non-cancellable operating lease. The lease has the expiration date of June 30, 2020. Rental, maintenance and tax expenses for this facility were approximately $472 and $475 in 2017 and 2016, respectively. The Company also leases 8,100 square feet of office space in Lawrence, Kansas, under a non-cancellable operating lease, to accommodate a portion of the Company’s engineering team. The lease has the expiration date of December 31, 2019. Rental, maintenance and tax expenses for this facility were approximately $108 in 2017 and 2016.

The following table summarizes future minimum rental payments under these leases as of December 31, 2017:

2018	$	577
2019		577
2020		234
Thereafter		—
	$	1,388