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Income Taxes - Operating Loss and Tax Credit Carryforwards (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Jan. 02, 2016
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Operating loss and tax credit carryforwards |  |
Deferred tax asset | $ 88,470 | $ 88,366
Deferred tax liability | 62,958 | $ 64,855
Federal |  |
Operating loss and tax credit carryforwards |  |
Research and development tax credit carryforwards | 7,400 |
State |  |
Operating loss and tax credit carryforwards |  |
Operating loss carryforwards | 49,100 |
Research and development tax credit carryforwards | 13,100 |
Silicon Clocks, Spectra Linear and Ember | Federal |  |
Operating loss and tax credit carryforwards |  |
Operating loss carryforwards | 44,500 |
Research and development tax credit carryforwards | 1,900 |
Energy Micro | Foreign |  |
Operating loss and tax credit carryforwards |  |
Operating loss carryforwards | $ 13,200 |

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