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Stockholders' Equity and Stock-Based Compensation - Stock-Based Compensation Expenses (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jul. 03, 2021 | Jun. 27, 2020 | Jul. 03, 2021 | Jul. 03, 2021 | Jun. 27, 2020 | Jun. 27, 2020
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |  |  |  |
Stock-based compensation expense | $ 280 | $ 436 | $ 646 | $ 646 | $ 531 | $ 531
Cost of revenues |  |  |  |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |  |  |  |
Stock-based compensation expense | 46 | 35 |  | 93 | 59 |
Research and development |  |  |  |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |  |  |  |
Stock-based compensation expense | 14 | 24 |  | 50 | (7) |
Sales and marketing |  |  |  |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |  |  |  |
Stock-based compensation expense | 41 | 134 |  | 139 | 173 |
General and administrative |  |  |  |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |  |  |  |
Stock-based compensation expense | $ 179 | $ 243 |  | $ 364 | $ 306 |

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