Leases and Rent Expense (Tables)

12 Months Ended

Dec. 31, 2018

Leases [Abstract]

Schedule of Future Minimum Operating Lease Payments

As of December 31, 2018, future minimum lease payments under operating leases were as follows (in thousands):

2019	$	267
2020	272
2021	207
2022	—
2023	—
Total minimum lease payments	$	746

Schedule of Operating Leases Rent Expense

Rent expense, including facility and various short-term equipment operating leases, was as follows (in thousands):

Years ended December 31,	2018		2017
Paid to companies controlled by certain shareholders	$	294	$	278
Paid to others	43		53
Total rent expense	$	337	$	331