Right to Use Liability - Right to Use Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Right to Use Assets
Right to use assets	$ 5,741	$ 5,741
Accumulated depreciation	(4,917)	(4,379)
Total	824	1,362
Right To Use Assets
Right to Use Assets
Right to use assets	5,400	10,673
Accumulated depreciation	(540)	(926)
Total	$ 4,860	$ 9,747