Leases - Lease Cost (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) lease_arrangement	Jun. 30, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Number of lease arrangements | lease_arrangement			7
Operating lease cost	$ 79	$ 171	$ 167	$ 343
Short-term lease cost	4	0	7	68
Total lease cost	$ 83	$ 171	$ 174	$ 411
Weighted average remaining lease term	4 years 2 months 12 days		4 years 2 months 12 days
Weighted average discount rate	3.62%		3.62%
Minimum
Lessee, Lease, Description [Line Items]
Term of lease	11 months		11 months
Maximum
Lessee, Lease, Description [Line Items]
Term of lease	5 years		5 years