Leases and Rent Expense (Tables)

12 Months Ended

Dec. 31, 2017

Leases [Abstract]

Schedule of Future Minimum Operating Lease Payments

As of December 31, 2017, future minimum lease payments under operating leases were as follows (in thousands):

2018	$	266
2019	267
2020	272
2021	207
2022	—
Total minimum lease payments	$	1,012

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,	2017		2016
Paid to companies controlled by shareholder	$	278	$	85
Paid to others	53		15
Total rent expense	$	331	$	100