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Cash and Investments (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | $ 140,365 | $ 129,959
Gross Unrealized Gains | 3 | 19
Gross Unrealized Losses | (11) | (17)
Estimated Fair Market Value | 140,357 | 129,961
U.S. Government agency securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 2,001 | 11,412
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (5) | (7)
Estimated Fair Market Value | 1,996 | 11,405
Commercial paper [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 17,907 | 22,402
Gross Unrealized Gains | 3 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Market Value | 17,910 | 22,402
Corporate debt securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 45,701 | 14,194
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (4) | (6)
Estimated Fair Market Value | 45,697 | 14,188
Asset-backed Securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 6,916 | 5,466
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (2) | (3)
Estimated Fair Market Value | 6,914 | 5,463
Cash [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 38,235 | 43,604
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Market Value | 38,235 | 43,604
Money market funds [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 812 | 959
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Market Value | 812 | 959
Certificates of deposits [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 23,298 | 23,000
Gross Unrealized Gains | 0 | 19
Gross Unrealized Losses | 0 | 0
Estimated Fair Market Value | 23,298 | 23,019
U.S. Treasury securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 501 | 5,667
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Market Value | 501 | 5,667
Commercial paper and corporate debt securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 4,994 | 2,499
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Market Value | $ 4,994 | 2,499
Municipal securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost |  | 756
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | (1)
Estimated Fair Market Value |  | $ 755

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