Leases - Weighted-Average Remaining Lease Term and Discount Rate (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Leases
Weighted-average remaining lease term (years)	7 years 6 months 14 days		7 years 11 months 8 days
Weighted-average discount rate	4.61%		4.61%
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 214	$ 80