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Fair Value Measurements (Fair Value Measurements On A Recurring Basis) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash and cash equivalents, Carrying amount | $ 1,090 | $ 8,785 | $ 1,057
Treasury Bills, carrying value | 7,999 | 0 |
Fair value, investments | 8,041 | 45 |
Equity Securities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale Securities, Carrying amount | 42 | 45 |
Fair value, investments | 42 | 45 |
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value, investments | 0 | 0 |
Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value, investments | 0 | 0 |
Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value, investments | 42 | 45 |
Commercial Paper [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash and cash equivalents, Carrying amount | 718 | 797 |
Cash and cash equivalents, Fair Value | 718 | 797 |
Commercial Paper [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash and cash equivalents, Fair Value | 718 | 797 |
Commercial Paper [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash and cash equivalents, Fair Value | 0 | 0 |
Commercial Paper [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash and cash equivalents, Fair Value | 0 | 0 |
Treasury Bills [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash and cash equivalents, Carrying amount | 7,999 | 7,734 |
Cash and cash equivalents, Fair Value | 7,999 | 7,734 |
Treasury Bills [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash and cash equivalents, Fair Value | 7,999 | 7,734 |
Treasury Bills [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash and cash equivalents, Fair Value | 0 | 0 |
Treasury Bills [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash and cash equivalents, Fair Value | $ 0 | $ 0 |

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