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Cash and Investments (Details) - USD ($) $ in Thousands | Sep. 24, 2016 | Dec. 26, 2015
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | $ 118,497 | $ 83,148
Gross Unrealized Gains | 34 | 2
Gross Unrealized Losses | (4) | (65)
Estimated Fair Market Value | 118,527 | 83,085
U.S. Government agency securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 14,301 | 20,193
Gross Unrealized Gains | 11 | 1
Gross Unrealized Losses | 0 | (29)
Estimated Fair Market Value | 14,312 | 20,165
Commercial paper [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 23,845 | 1,884
Gross Unrealized Gains | 3 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Market Value | 23,848 | 1,884
Asset-backed securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 7,470 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (2) |
Estimated Fair Market Value | 7,468 |
Corporate debt securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 11,762 | 14,759
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (1) | (23)
Estimated Fair Market Value | 11,761 | 14,736
Cash [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 32,337 | 32,996
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Market Value | 32,337 | 32,996
Money market funds [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 840 | 590
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Market Value | 840 | 590
U.S. Treasury securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 6,935 | 4,411
Gross Unrealized Gains | 9 | 0
Gross Unrealized Losses | 0 | (10)
Estimated Fair Market Value | 6,944 | 4,401
Commercial paper and corporate debt securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 4,245 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (1) |
Estimated Fair Market Value | 4,244 |
Commercial paper and corporate debt securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost |  | 4,568
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | 0
Estimated Fair Market Value |  | 4,568
Certificates of deposits [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 15,997 |
Gross Unrealized Gains | 11 |
Gross Unrealized Losses | 0 |
Estimated Fair Market Value | 16,008 |
Municipal securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 765 | 3,747
Gross Unrealized Gains | 0 | 1
Gross Unrealized Losses | 0 | (3)
Estimated Fair Market Value | $ 765 | $ 3,745

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