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Stockholders' Equity and Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 28, 2019
Share-based Payment Arrangement [Abstract] |
NonVested Restricted Common Stock |
| Shares |  | Weighted Average Grant Fair Value
Outstanding at December 31, 2016 | 3,007,674 |  |  | $ | 3.21 |
Granted | 1,152,000 |  |  | 3.40 |
Forfeited | (465,150 | ) |  | 3.82 |
Vested | (1,065,250 | ) |  | 2.90 |
Outstanding at December 30, 2017 | 2,629,274 |  |  | 3.31 |
Granted | 1,549,000 |  |  | 2.25 |
Forfeited | (872,025 | ) |  | 3.78 |
Vested | (1,093,000 | ) |  | 3.05 |
Balance at December 29, 2018 | 2,213,249 |  |  | 2.51 |
Granted | 645,000 |  |  | 0.57 |
Forfeited | (355,625 | ) |  | 2.95 |
Vested | (639,500 | ) |  | 2.98 |
Balance at December 28, 2019 | 1,863,124 |  |  | $ | 1.60 |
Stock-Based Compensation Expense | for the fiscal years 2019, 2018 and 2017 (no tax benefits were recognized):
| 2019 |  | 2018 |  | 2017
Cost of product revenues | $ | 102,629 |  |  | $ | 418,605 |  |  | $ | 490,481 |
Research and development | 295,872 |  |  | 725,112 |  |  | 799,485 |
Selling, general and administrative | 1,658,899 |  |  | 3,647,337 |  |  | 1,006,165 |
Total | $ | 2,057,400 |  |  | $ | 4,791,054 |  |  | $ | 2,296,131 |

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