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Cash and Investments (Details) - USD ($) $ in Thousands | Sep. 29, 2018 | Dec. 30, 2017
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | $ 173,046 | $ 117,162
Gross Unrealized Gains | 6 | 0
Gross Unrealized Losses | (114) | (133)
Estimated Fair Market Value | 172,938 | 117,029
Cash [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 94,419 | 34,643
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Market Value | 94,419 | 34,643
Money market funds [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 1,684 | 256
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Market Value | 1,684 | 256
Certificates of deposits [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 14,496 | 14,498
Gross Unrealized Gains | 6 | 0
Gross Unrealized Losses | 0 | (1)
Estimated Fair Market Value | 14,502 | 14,497
U.S. Government agency securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost |  | 1,500
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | (5)
Estimated Fair Market Value |  | 1,495
Commercial paper [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 11,185 | 7,952
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | (3)
Estimated Fair Market Value | 11,185 | 7,949
Corporate debt securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 37,038 | 48,073
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (88) | (105)
Estimated Fair Market Value | 36,950 | 47,968
Asset-backed Securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 14,224 | 10,240
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (26) | (19)
Estimated Fair Market Value | $ 14,198 | $ 10,221

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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