Leases (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Operating leases
Operating lease expense	$ 120	$ 180	$ 240	$ 360
Variable lease expense	65	66	134	121
Operating lease expense	185	246	374	481
Short-term lease rent expense	64	1	127	3
Total expense	$ 249	$ 247	$ 501	$ 484