Summary of Significant Accounting Policies (Recent Accounting Pronouncements - Leases) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Right-of-use asset	$ 946	$ 1,308
Lease liability	$ 1,450	$ 2,004