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Stockholders’ Equity and Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 26, 2020
Equity [Abstract] |
Schedule of Non-vested Restricted Stock Activity | Schedule of Non-vested Restricted Stock Activity
|  | Shares |  |  | Weighted Average Grant Fair Value |
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 |
Outstanding 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 |
Granted |  |  | 2,381,000 |  |  |  | 1.42 |
Forfeited |  |  | (153,595 | ) |  |  | 1.71 |
Vested |  |  | (1,038,655 | ) |  |  | 0.96 |
Balance at December 26, 2020 |  |  | 3,051,874 |  |  | $ | 1.67 |
Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions | Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions
Expected volatility |  |  | 94.2 | %
Interest rate |  |  | 0.2 | %
Expected life (years) |  |  | 0.7 |
Dividend yield |  |  | — | %
Schedule of Stock-based Compensation Expense | The following table summarizes stock-based compensation expense within each of the categories below as it relates to non-vested restricted common stock awards for the fiscal years 2020, 2019 and 2018 (no tax benefits were recognized): Schedule of Stock-based Compensation Expense
|  | 2020 |  |  | 2019 |  |  | 2018 |
Cost of product revenues |  | $ | 113,517 |  |  | $ | 102,629 |  |  | $ | 418,605 |
Research and development |  |  | 204,599 |  |  |  | 295,872 |  |  |  | 725,112 |
Selling, general and administrative |  |  | 503,006 |  |  |  | 1,658,899 |  |  |  | 3,647,337 |
Total |  | $ | 821,122 |  |  | $ | 2,057,400 |  |  | $ | 4,791,054 |

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of employee stock purchase plans, including, but not limited to: (a) expected term, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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