Property and Equipment - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Depreciation	$ 600	$ 600	$ 1,800	$ 1,700
Accumulated depreciation	10,774		10,774		$ 9,865
Assets under operating leases
Property, Plant and Equipment [Line Items]
Gross assets	4,300		4,300		4,600
Accumulated depreciation	$ 1,100		$ 1,100		$ 800