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Summary Of Significant Accounting Policies (Summary Of Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Assets |  |
Total assets measured at fair value | $ 67,372 | $ 76,478
Liabilities |  |
Total liabilities measured at fair value | 183 | 356
Financing Derivative [Member] |  |
Liabilities |  |
Total liabilities measured at fair value | 183 | 356
Cash and cash equivalents [Member] |  |
Assets |  |
Total cash and cash equivalents | 16,507 | 16,765
Cash and cash equivalents [Member] | Cash and money market funds [Member] |  |
Assets |  |
Total cash and cash equivalents | 14,858 | 14,516
Cash and cash equivalents [Member] | Commercial paper [Member] |  |
Assets |  |
Total cash and cash equivalents | 1,649 | 2,249
Investments [Member] |  |
Assets |  |
Total investments | 46,365 | 55,213
Investments [Member] | Commercial paper [Member] |  |
Assets |  |
Total investments | 20,394 | 23,583
Investments [Member] | Corporate debt securities [Member] |  |
Assets |  |
Total investments | 9,034 | 10,739
Investments [Member] | U.S. government and agency securities [Member] |  |
Assets |  |
Total investments | 16,937 | 20,579
Investments [Member] | Asset backed securities [Member] |  |
Assets |  |
Total investments |  | 312
Long-term restricted cash [Member] | Cash [Member] |  |
Assets |  |
Long-term restricted cash | 4,500 | 4,500
Level 1 [Member] |  |
Assets |  |
Total assets measured at fair value | 19,358 | 19,016
Level 1 [Member] | Cash and cash equivalents [Member] |  |
Assets |  |
Total cash and cash equivalents | 14,858 | 14,516
Level 1 [Member] | Cash and cash equivalents [Member] | Cash and money market funds [Member] |  |
Assets |  |
Total cash and cash equivalents | 14,858 | 14,516
Level 1 [Member] | Long-term restricted cash [Member] | Cash [Member] |  |
Assets |  |
Long-term restricted cash | 4,500 | 4,500
Level 2 [Member] |  |
Assets |  |
Total assets measured at fair value | 48,014 | 57,462
Level 2 [Member] | Cash and cash equivalents [Member] |  |
Assets |  |
Total cash and cash equivalents | 1,649 | 2,249
Level 2 [Member] | Cash and cash equivalents [Member] | Commercial paper [Member] |  |
Assets |  |
Total cash and cash equivalents | 1,649 | 2,249
Level 2 [Member] | Investments [Member] |  |
Assets |  |
Total investments | 46,365 | 55,213
Level 2 [Member] | Investments [Member] | Commercial paper [Member] |  |
Assets |  |
Total investments | 20,394 | 23,583
Level 2 [Member] | Investments [Member] | Corporate debt securities [Member] |  |
Assets |  |
Total investments | 9,034 | 10,739
Level 2 [Member] | Investments [Member] | U.S. government and agency securities [Member] |  |
Assets |  |
Total investments | 16,937 | 20,579
Level 2 [Member] | Investments [Member] | Asset backed securities [Member] |  |
Assets |  |
Total investments |  | 312
Level 3 [Member] |  |
Liabilities |  |
Total liabilities measured at fair value | 183 | 356
Level 3 [Member] | Financing Derivative [Member] |  |
Liabilities |  |
Total liabilities measured at fair value | $ 183 | $ 356

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