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Cash, Cash Equivalents And Investments (Summary Of Cash, Cash Equivalents And Investments) (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | $ 83,967 | $ 71,973
Gross unrealized gains | 3 | 13
Gross unrealized losses | (5) | (8)
Fair value | 83,965 | 71,978
Cash and cash equivalents [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 25,931 | 16,765
Gross unrealized gains |  |
Gross unrealized losses |  |
Fair value | 25,931 | 16,765
Investments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 58,036 | 55,208
Gross unrealized gains | 3 | 13
Gross unrealized losses | (5) | (8)
Fair value | 58,034 | 55,213
Cash and money market funds [Member] | Cash and cash equivalents [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 22,283 | 14,516
Gross unrealized gains |  |
Gross unrealized losses |  |
Fair value | 22,283 | 14,516
Commercial paper [Member] | Cash and cash equivalents [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 3,648 | 2,249
Gross unrealized gains |  |
Gross unrealized losses |  |
Fair value | 3,648 | 2,249
Commercial paper [Member] | Investments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 23,881 | 23,581
Gross unrealized gains | 2 | 5
Gross unrealized losses | (1) | (3)
Fair value | 23,882 | 23,583
Corporate debt securities [Member] | Investments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 9,399 | 10,741
Gross unrealized gains | 1 | 1
Gross unrealized losses | (1) | (3)
Fair value | 9,399 | 10,739
Asset backed securities [Member] | Investments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost |  | 312
Gross unrealized gains |  |
Gross unrealized losses |  |
Fair value |  | 312
U.S. government and agency securities [Member] | Investments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 24,756 | 20,574
Gross unrealized gains |  | 7
Gross unrealized losses | (3) | (2)
Fair value | 24,753 | 20,579
Cash [Member] | Long-term restricted cash [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost | 4,500 | 4,500
Gross unrealized gains |  |
Gross unrealized losses |  |
Fair value | $ 4,500 | $ 4,500

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