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Cash and Investments (Details) - USD ($) $ in Thousands | Apr. 01, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | $ 132,107 | $ 129,959
Gross Unrealized Gains | 5 | 19
Gross Unrealized Losses | (16) | (17)
Estimated Fair Market Value | 132,096 | 129,961
U.S. Government agency securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 8,710 | 11,412
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (6) | (7)
Estimated Fair Market Value | 8,704 | 11,405
Commercial paper [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 22,325 | 22,402
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (2) | 0
Estimated Fair Market Value | 22,323 | 22,402
Corporate debt securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 25,875 | 14,194
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (6) | (6)
Estimated Fair Market Value | 25,869 | 14,188
Asset-backed Securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 3,274 | 5,466
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (1) | (3)
Estimated Fair Market Value | 3,273 | 5,463
Cash [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 45,559 | 43,604
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Market Value | 45,559 | 43,604
Money market funds [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 858 | 959
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Market Value | 858 | 959
Certificates of deposits [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 21,500 | 23,000
Gross Unrealized Gains | 5 | 19
Gross Unrealized Losses | 0 | 0
Estimated Fair Market Value | 21,505 | 23,019
U.S. Treasury securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 3,006 | 5,667
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (1) | 0
Estimated Fair Market Value | 3,005 | 5,667
Commercial paper and corporate debt securities [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost | 1,000 | 2,499
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Market Value | $ 1,000 | 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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