Leases - Weighted Average Remaining Lease Term and Discount Rate (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2019 USD ($)
Leases
Weighted average remaining lease term (years)	8 years 1 month 24 days
Weighted average discount rate	4.61%
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 159
Leased assets obtained in exchange for new operating lease liabilities	$ 2,072