Components of Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019
Leases [Abstract]
Operating lease cost	$ 116	$ 232
Finance lease expense:
Amortization of leased assets	4	8
Interest on lease liabilities	2	3
Total finance lease cost	6	11
Total lease expense	$ 122	$ 243