Right to Use Liability - Future Changes in the Right to Use Liabilities (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) item	Sep. 30, 2016 item
Right to Use Liabilities
Scheduled derecognition of right to use liability due to reductions in the lease deposit to less than two months rent	$ 5,000
Number of month's rent the lease deposit is less than | item	2	2
Right to Use Liabilities
Right to Use Liabilities
2019	$ 486
2020	486
2021	486
2022	486
2023	486
Thereafter	7,889
Total minimum lease payments	10,319
Amounts representing interest	(5,172)
Present value of net minimum right to use liability payments	$ 5,147