Leases - Lease, Cost (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Leases [Abstract]
Operating lease expense	$ 140	$ 420
Short-term lease expense	11	37
Variable lease expense	3	8
Other	1	4
Total lease expense	$ 155	$ 469