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Fair Value Measurements (Narrative) (Details) - USD ($) | Sep. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount | $ 0 |  | $ 0
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount | 0 |  | 0
Fair Value, Liabilities, Level 1 to Level 2 Transfers, Amount | 0 |  | 0
Fair Value, Liabilities, Level 2 to Level 1 Transfers, Amount | 0 |  | $ 0
Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Financial liabilities | $ 258,000 | $ 430,000 |

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