Leasing Arrangements - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Jan. 01, 2019
Lessee Disclosure [Abstract]
Operating lease cost	$ 857	$ 2,623
Additional operating lease,right-of-use assets resulted from new operating lease liabilities		217
Operating lease liability	$ 2,456	$ 2,456	$ 14,400
Weighted average remaining lease term of operating leases	7 years 9 months 18 days	7 years 9 months 18 days
Weighted average discount rate of operating lease liabilities	4.70%	4.70%