Leases - Components of Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Lease expense
Operating lease	$ 127	$ 62	$ 255	$ 123
Short-term lease expense	21	14	34	28
Total	$ 148	$ 76	$ 289	$ 151