Leases - Rent Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Leases [Abstract]
Operating lease costs	$ 320	$ 407	$ 1,099	$ 1,214
Variable rent costs	155	(37)	141	(110)
Total rent expense	$ 475	$ 370	$ 1,240	$ 1,104