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Stockholders' Equity and Stock-Based Compensation - Stock-Based Compensation Expenses (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 26, 2020 | Sep. 28, 2019 | Sep. 26, 2020 | Sep. 26, 2020 | Sep. 28, 2019 | Sep. 28, 2019
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |  |  |  |
Stock-based compensation expense | $ 243 | $ 158 | $ 774 | $ 774 | $ 1,398 | $ 1,398
Cost of revenues |  |  |  |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |  |  |  |
Stock-based compensation expense | 46 | 16 |  | 105 | 45 |
Research and development |  |  |  |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |  |  |  |
Stock-based compensation expense | (27) |  |  | (34) | 165 |
Sales and marketing |  |  |  |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |  |  |  |
Stock-based compensation expense | 149 | 81 |  | 322 | 290 |
General and administrative |  |  |  |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |  |  |  |
Stock-based compensation expense | $ 75 | $ 61 |  | $ 381 | $ 898 |

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