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Fair Value Measurements (Fair Value Measurements On A Recurring Basis) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash and cash equivalents, Carrying amount | $ 963 | $ 840 | $ 569
Treasury Bills, carrying value | 7,711 | 7,427 |
Available-for-sale Securities, Fair Value | 7,756 | 7,427 |
Obligations [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Contingent Earn-out, Carrying Value | 150 | 195 |
Contingent Earn-out, Fair Value | 150 | 195 |
Fair Value, Inputs, Level 1 [Member] | Obligations [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Contingent Earn-out, Fair Value | 0 | 0 |
Fair Value, Inputs, Level 2 [Member] | Obligations [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Contingent Earn-out, Fair Value | 0 | 0 |
Fair Value, Inputs, Level 3 [Member] | Obligations [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Contingent Earn-out, Fair Value | 150 | 195 |
Limited Marketable Company [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale Securities, Carrying amount | 45 | 0 |
Available-for-sale Securities, Fair Value | 45 | 0 |
Limited Marketable Company [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale Securities, Fair Value | 0 | 0 |
Limited Marketable Company [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale Securities, Fair Value | 0 | 0 |
Limited Marketable Company [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale Securities, Fair Value | 45 | 0 |
Commercial Paper [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash and cash equivalents, Carrying amount | 568 | 348 |
Cash and cash equivalents, Fair Value | 568 | 348 |
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 | 568 | 348 |
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] |  |  |
Treasury Bills, carrying value | 7,711 | 7,427 |
Treasury Bills, fair value | 7,711 | 7,427 |
Treasury Bills [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Treasury Bills, fair value | 7,711 | 7,427 |
Treasury Bills [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Treasury Bills, 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] |  |  |
Treasury Bills, fair value | $ 0 | $ 0 |

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