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Cash and Investments (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 26, 2015
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | $ 129,959 | $ 83,148
Gross Unrealized Gains | 19 | 2
Gross Unrealized Losses | (17) | (65)
Estimated Fair Market Value | 129,961 | 83,085
Commercial paper [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 22,402 | 1,884
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Market Value | 22,402 | 1,884
U.S. Government agency securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 11,412 | 20,193
Gross Unrealized Gains | 0 | 1
Gross Unrealized Losses | (7) | (29)
Estimated Fair Market Value | 11,405 | 20,165
Corporate debt securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 14,194 | 14,759
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (6) | (23)
Estimated Fair Market Value | 14,188 | 14,736
Asset-backed Securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 5,466 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (3) |
Estimated Fair Market Value | 5,463 |
Cash [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 43,604 | 32,996
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Market Value | 43,604 | 32,996
Money market funds [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 959 | 590
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Market Value | 959 | 590
U.S. Treasury securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 5,667 | 4,411
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | (10)
Estimated Fair Market Value | 5,667 | 4,401
Certificates of deposits [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 23,000 |
Gross Unrealized Gains | 19 |
Gross Unrealized Losses | 0 |
Estimated Fair Market Value | 23,019 |
Commercial paper and corporate debt securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 2,499 | 4,568
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Market Value | 2,499 | 4,568
Municipal securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 756 | 3,747
Gross Unrealized Gains | 0 | 1
Gross Unrealized Losses | (1) | (3)
Estimated Fair Market Value | $ 755 | $ 3,745

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