Leases - Components of Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Lease expense
Operating lease	$ 128	$ 106	$ 383	$ 229
Short-term lease expense	27	14	61	42
Total	$ 155	$ 120	$ 444	$ 271