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Income Taxes - Tax Effect of Temporary Differences and Carryforwards that Give Rise to Significant Portions of the Net Deferred Tax Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Jan. 02, 2016
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Tax effect of temporary differences and carryforwards that give rise to significant portions of the net deferred tax assets |  |
Net operating losses | $ 4,411 | $ 4,135
Research and development credits | 2,113 | 1,820
Accruals and reserves | 2,158 | 1,823
Deferred revenue | 104 | 120
Property and equipment | 396 | 399
Intangible assets | 783 | 792
Stock compensation | 972 | 613
Other tax credits | 90 | 89
Net deferred tax asset | 11,027 | 9,791
Valuation allowance | (11,095) | (806)
Net deferred tax assets |  | $ 8,985
Net deferred tax (liabilities) | $ (68) |

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