Leasing Arrangements - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019	Jan. 01, 2019
Lessee Disclosure [Abstract]
Operating lease cost	$ 869	$ 1,746
Additional operating lease,right-of-use assets resulted from new operating lease liabilities		222
Operating lease liability	$ 1,656	$ 1,656	$ 14,400
Weighted average remaining lease term of operating leases	7 years 10 months 24 days	7 years 10 months 24 days
Weighted average discount rate of operating lease liabilities	4.70%	4.70%