Leases - Components of Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Leases [Abstract]
Operating lease expense	$ 55	$ 167
Finance lease expense, Amortization of ROU assets	47	106
Finance lease expense, Interest on lease liabilities	4	7
Short-term lease expense	23	68
Total lease expense	$ 129	$ 348