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Cash and Investments (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 30, 2017
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | $ 148,863 | $ 117,162
Gross Unrealized Gains | 1 | 0
Gross Unrealized Losses | (162) | (133)
Estimated Fair Market Value | 148,702 | 117,029
U.S. Government agency securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 1,500 | 1,500
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (1) | (5)
Estimated Fair Market Value | 1,499 | 1,495
Commercial paper [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 4,974 | 7,952
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | (3)
Estimated Fair Market Value | 4,974 | 7,949
Corporate debt securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 36,807 | 48,073
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (130) | (105)
Estimated Fair Market Value | 36,677 | 47,968
Asset-backed Securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 10,383 | 10,240
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (31) | (19)
Estimated Fair Market Value | 10,352 | 10,221
Cash [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 70,657 | 34,643
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Market Value | 70,657 | 34,643
Money market funds [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 9,563 | 256
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Market Value | 9,563 | 256
Commerical paper and Certificates of deposit [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 5,980 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | 0 |
Estimated Fair Market Value | 5,980 |
Certificates of deposits [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 8,999 | 14,498
Gross Unrealized Gains | 1 | 0
Gross Unrealized Losses | 0 | (1)
Estimated Fair Market Value | $ 9,000 | $ 14,497

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