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Stockholders' Equity and Stock-Based Compensation (Stock-Based Compensation) (Details) - USD ($) | 12 Months Ended
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Dec. 28, 2019 | Dec. 29, 2018 | Dec. 30, 2017
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Stock-based compensation | $ 2,057,400 | $ 4,791,054 | $ 2,296,131
Cost of product revenues |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Stock-based compensation | 102,629 | 418,605 | 490,481
Research and development |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Stock-based compensation | 295,872 | 725,112 | 799,485
Selling, general and administrative |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Stock-based compensation | $ 1,658,899 | $ 3,647,337 | $ 1,006,165

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