Leases - Additional Information (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Leases
Lessee, Operating Lease, Term of Contract	11 years
Operating Lease, Right-of-Use Asset	$ 7,014		$ 0
Operating Lease, initial right-of-use asset	8,100
Operating Lease, Payments	1,500
Operating Lease, Cost	$ 1,500	$ 1,200