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Summary Of Significant Accounting Policies (Summary Of Assets And Liabilities Measured At Fair Value Classified Based On Level Of Input) (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Assets |  |
Total assets measured at fair value | $ 76,478 | $ 86,770
Liabilities |  |
Total liabilities measured at fair value | 356 | 600
Financing Derivative [Member] |  |
Liabilities |  |
Total liabilities measured at fair value | 356 | 600
Cash and cash equivalents [Member] |  |
Assets |  |
Total cash and cash equivalents | 16,765 | 33,629
Cash and cash equivalents [Member] | Cash and money market funds [Member] |  |
Assets |  |
Total cash and cash equivalents | 14,516 | 22,034
Cash and cash equivalents [Member] | Commercial paper [Member] |  |
Assets |  |
Total cash and cash equivalents | 2,249 | 8,595
Cash and cash equivalents [Member] | U.S. government and agency securities [Member] |  |
Assets |  |
Total cash and cash equivalents |  | 3,000
Investments [Member] |  |
Assets |  |
Total investments | 55,213 | 48,641
Investments [Member] | Commercial paper [Member] |  |
Assets |  |
Total investments | 23,583 | 15,903
Investments [Member] | Corporate debt securities [Member] |  |
Assets |  |
Total investments | 10,739 | 1,265
Investments [Member] | U.S. government and agency securities [Member] |  |
Assets |  |
Total investments | 20,579 | 28,136
Investments [Member] | Asset backed securities [Member] |  |
Assets |  |
Total investments | 312 | 3,337
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 | 19,016 | 26,534
Level 1 [Member] | Cash and cash equivalents [Member] |  |
Assets |  |
Total cash and cash equivalents | 14,516 | 22,034
Level 1 [Member] | Cash and cash equivalents [Member] | Cash and money market funds [Member] |  |
Assets |  |
Total cash and cash equivalents | 14,516 | 22,034
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 | 57,462 | 60,236
Level 2 [Member] | Cash and cash equivalents [Member] |  |
Assets |  |
Total cash and cash equivalents | 2,249 | 11,595
Level 2 [Member] | Cash and cash equivalents [Member] | Commercial paper [Member] |  |
Assets |  |
Total cash and cash equivalents | 2,249 | 8,595
Level 2 [Member] | Cash and cash equivalents [Member] | U.S. government and agency securities [Member] |  |
Assets |  |
Total cash and cash equivalents |  | 3,000
Level 2 [Member] | Investments [Member] |  |
Assets |  |
Total investments | 55,213 | 48,641
Level 2 [Member] | Investments [Member] | Commercial paper [Member] |  |
Assets |  |
Total investments | 23,583 | 15,903
Level 2 [Member] | Investments [Member] | Corporate debt securities [Member] |  |
Assets |  |
Total investments | 10,739 | 1,265
Level 2 [Member] | Investments [Member] | U.S. government and agency securities [Member] |  |
Assets |  |
Total investments | 20,579 | 28,136
Level 2 [Member] | Investments [Member] | Asset backed securities [Member] |  |
Assets |  |
Total investments | 312 | 3,337
Level 3 [Member] |  |
Liabilities |  |
Total liabilities measured at fair value | 356 | 600
Level 3 [Member] | Financing Derivative [Member] |  |
Liabilities |  |
Total liabilities measured at fair value | $ 356 | $ 600

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