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Stock-Based Compensation | 12 Months Ended
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Dec. 31, 2022
Share-Based Payment Arrangement [Abstract] |
Stock-Based Compensation | 13. Stock-Based Compensation From time to time, we issue stock options and restricted stock as compensation for services rendered by our directors and employees. Restricted Stock On January 6, 2022 and February 15, 2021, we issued 8,097 shares and 12,207 shares, respectively, of restricted common stock to our directors as part of their annual compensation plan. The grants of restricted common stock were made outside the 2015 Plan and were not subject to vesting. Stock compensation of $57,500 was recorded on this issuance of restricted common stock for the years ended December 31, 2022 and 2021. Stock Options On April 14, 2022, we granted employees stock options to purchase 220,587 shares at an exercise price of $6.08 per share in accordance with the 2015 Plan, with vesting continuing until 2025. The total fair value of $1,152,470 for these stock options is being recognized over the requisite service period. We did not make any stock option grants during 2021. The weighted-average grant date fair value of options granted during the year ended December 31, 2022 was $5.22. The weighted average assumptions that were used in calculating such values during the year ended December 31, 2022, as well as the assumptions that were used in calculating such values, were based on estimates at the grant date in the table as follows: Schedule of Estimated Values of Stock Option Grants Valuation Assumptions
|  | Grant Date April 14, 2022 |
Risk-free interest rate |  |  | 2.82 | %
Weighted average expected term |  |  | 6 years |
Expected volatility |  |  | 116.60 | %
Expected dividend yield |  |  | 0.00 | %
A summary of stock option activity during the years ended December 31, 2022 and 2021 is as follows: Schedule of Stock Option Activity
|  |  |  |  |  |  |  | Weighted- |  |  |  |
|  |  |  |  | Weighted- |  |  | Average |  |  |  |
|  | Shares |  |  | Average |  |  | Remaining |  |  | Aggregate |
|  | Under |  |  | Exercise |  |  | Contractual |  |  | Intrinsic |
|  | Option |  |  | Price |  |  | Life |  |  | Value |
Outstanding at January 1, 2022 |  |  | 144,860 |  |  | $ | 5.61 |  |  |  | 8 years |  |  | $ | 19,200 |
Granted |  |  | 220,587 |  |  |  | 6.08 |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2022 |  |  | 365,447 |  |  | $ | 5.89 |  |  |  | 8 years |  |  | $ | 19,200 |
Exercisable at December 31, 2022 |  |  | 93,085 |  |  | $ | 6.44 |  |  |  | 7 years |  |  | $ | 19,200 |
|  |  |  |  |  |  |  | Weighted- |  |  |  |
|  |  |  |  | Weighted- |  |  | Average |  |  |  |
|  | Shares |  |  | Average |  |  | Remaining |  |  | Aggregate |
|  | Under |  |  | Exercise |  |  | Contractual |  |  | Intrinsic |
|  | Option |  |  | Price |  |  | Life |  |  | Value |
Outstanding at January 1, 2021 |  |  | 145,360 |  |  | $ | 5.61 |  |  |  | 9 years |  |  | $ | 19,200 |
Forfeited and expired |  |  | (500 | ) |  |  | 6.50 |  |  |  |  |  |  |  |  |
Outstanding at December 31, 2021 |  |  | 144,860 |  |  | $ | 5.61 |  |  |  | 8 years |  |  | $ | 19,200 |
Exercisable at December 31, 2021 |  |  | 66,060 |  |  | $ | 7.35 |  |  |  | 8 years |  |  | $ | 19,200 |
During the years ended December 31, 2022 and 2021, stock-based compensation for options was $363,950 and $92,253, respectively. As of December 31, 2022 and 2021, there was $1,019,140 and $230,620, respectively, of total unrecognized compensation costs related to stock options granted under our stock option agreements. The unrecognized compensation cost is expected to be recognized over a weighted-average period of two years. The total fair value of stock options that vested during the years ended December 31, 2022, and 2021 was $91,913. Issues of Stock-Based Compensation The following represent grants of stock options, including the fair value recognized or to be recognized over the requisite service period: Schedule of Grants of Stock Options Over Requisite Service Period
Grant date |  | Shares granted (canceled) |  |  | Exercise price |  |  | Date fully vested |  |  | Fair value |
February 10, 2016 |  |  | 4,200 |  |  | $ | 48.00 |  |  |  | February 10, 2020 |  |  | $ | 174,748 |
December 6, 2016 |  |  | 2,000 |  |  |  | 38.00 |  |  |  | December 6, 2020 |  |  |  | 63,937 |
September 25, 2017 |  |  | 15,000 |  |  |  | 15.00 |  |  |  | September 25, 2019 |  |  |  | 194,149 |
September 25, 2017 |  |  | 10,000 |  |  |  | 19.00 |  |  |  | September 25, 2019 |  |  |  | 126,862 |
January 30, 2019 |  |  | 250 |  |  |  | 45.00 |  |  |  | January 30, 2019 |  |  |  | 885 |
March 11, 2019 |  |  | (33,200 | ) |  |  | - |  |  |  | - |  |  |  | - |
March 11, 2019 |  |  | 33,200 |  |  |  | 6.50 |  |  |  | December 6, 2020 |  |  |  | 24,898 | (1)
March 11, 2019 |  |  | 10,100 |  |  |  | 6.50 |  |  |  | March 11, 2023 |  |  |  | 44,591 |
September 2, 2020 |  |  | 99,000 |  |  |  | 4.00 |  |  |  | September 2, 2024 |  |  |  | 327,181 |
April 14, 2022 |  |  | 220,587 |  |  |  | 6.08 |  |  |  | April 14, 2025 |  |  |  | 1,152,470 |
| (1) | Represents incremental fair value of replacement shares compared to canceled shares.

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