Fair Value of Financial Instruments (Summary of Fair Value of Financial Assets Measured on a Recurring Basis) (Details) - Level 1 [Member] - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	$ 9,358	$ 9,617
Restricted cash	$ 655	$ 655