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Cash And Cash Equivalents And Investments (Summary Of Cash, Cash Equivalents And Investments) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | $ 62,904 | $ 71,973
Gross unrealized gains |  | 13
Gross unrealized losses | (32) | (8)
Fair value | 62,872 | 71,978
Cash and cash equivalents [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 16,507 | 16,765
Fair value | 16,507 | 16,765
Investments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 46,397 | 55,208
Gross unrealized gains |  | 13
Gross unrealized losses | (32) | (8)
Fair value | 46,365 | 55,213
Cash and money market funds [Member] | Cash and cash equivalents [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 14,858 | 14,516
Fair value | 14,858 | 14,516
Commercial paper [Member] | Cash and cash equivalents [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 1,649 | 2,249
Fair value | 1,649 | 2,249
Commercial paper [Member] | Investments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 20,408 | 23,581
Gross unrealized gains |  | 5
Gross unrealized losses | (14) | (3)
Fair value | 20,394 | 23,583
Corporate debt securities [Member] | Investments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 9,043 | 10,741
Gross unrealized gains |  | 1
Gross unrealized losses | (9) | (3)
Fair value | 9,034 | 10,739
Asset backed securities [Member] | Investments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost |  | 312
Fair value |  | 312
U.S. government and agency securities [Member] | Investments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 16,946 | 20,574
Gross unrealized gains |  | 7
Gross unrealized losses | (9) | (2)
Fair value | 16,937 | 20,579
Cash [Member] | Long-term restricted cash [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 4,500 | 4,500
Fair value | $ 4,500 | $ 4,500

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