Leases - Components of Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019
Leases [Abstract]
Operating lease expense	$ 56	$ 112
Finance Lease Cost, Amortization of ROU assets	30	59
Finance Lease Cost, Interest on lease liabilities	1	3
Short-term lease expense	22	45
Total lease expense	$ 109	$ 219