Leasing Arrangements - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Jan. 01, 2019
Lessee Disclosure [Abstract]
Operating lease cost	$ 877
Additional operating lease,right-of-use assets resulted from new operating lease liabilities	10
Operating lease liability	$ 846	$ 14,400
Weighted average remaining lease term of operating leases	8 years 1 month 6 days
Weighted average discount rate of operating lease liabilities	4.70%