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Stock Options and Stock Grants (Tables) | 12 Months Ended
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Dec. 31, 2023
Share-Based Payment Arrangement [Abstract] |
We follow ASC Topic 718, Share-Based Payments, in which compensation expense is recognized only for share-based payments expected to vest. | We follow ASC Topic 718, Share-Based Payments, in which compensation expense is recognized only for share-based payments expected to vest.
|  | Years ended December 31, |
|  | 2023 |  |  | 2022 |
Share-based compensation expense |  | $ | 773 |  |  | $ | 625 |
Remaining unrecognized compensation expense |  | $ | 1,118 |  |  |  | 1,732 |
Remaining weighted average-period, expense recognition (years) |  |  | 1.8 |  |  |  | 2.5 |
The following table illustrates the various assumptions used to calculate the Black-Scholes option pricing model for options granted for all years presented: | The following table illustrates the various assumptions used to calculate the Black-Scholes option pricing model for options granted for all years presented:
|  | Years Ended December 31, |
|  | 2023 |  |  | 2022 |
Weighted-average risk-free interest rates: |  |  | 3.8 | % |  |  | 3.5 | %
Dividend yield: |  |  | 0 | % |  |  | 0 | %
Weighted-average expected life (years) of the option: |  |  | 4 |  |  |  | 5 |
Weighted-average expected stock price volatility: |  |  | 93 | % |  |  | 116 | %
Weighted-average fair value of the options granted: |  | $ | 0.50 |  |  | $ | 0.97 |
Additional disclosures for options granted for all years presented: | Additional disclosures for options granted for all years presented:
|  | Years Ended December 31, |
|  | 2023 |  |  | 2022 |
Vesting period (years) of shares granted in period |  |  | 3 |  |  |  | 3 |
Contractual life (years) of shares granted in period |  |  | 7 |  |  |  | 7 |
Estimated forfeitures |  |  | 8 | % |  |  | 4 | %
The following table summarizes the option activity for our employees and directors during the year ended December 31, 2023: | The following table summarizes the option activity for our employees and directors during the year ended December 31, 2023:
|  |  |  |  |  |  |  | Weighted |  |  |  |
|  |  |  |  | Weighted |  |  | Average |  |  | Aggregate |
|  |  |  |  | Average |  |  | Remaining |  |  | Intrinsic |
|  | Shares |  |  | Exercise Price |  |  | Contractual |  |  | Value |
Options |  | (Rounded) |  |  | per Share |  |  | Term (Years) |  |  | (000s) |
Outstanding on January 1, 2023 |  |  | 3,443,661 |  |  | $ | 1.33 |  |  |  | 4.9 |  |  |  | 1,230 |
Granted |  |  | 668,200 |  |  | $ | 0.68 |  |  |  |  |  |  |  |  |
Exercised |  |  | (294,074 | ) |  | $ | 0.50 |  |  |  |  |  |  |  |  |
Forfeited or expired |  |  | (291,821 | ) |  | $ | 1.92 |  |  |  |  |  |  |  |  |
Outstanding on December 31, 2023 |  |  | 3,525,966 |  |  | $ | 1.22 |  |  |  | 4.2 |  |  | $ | 160 |
Exercisable on December 31, 2023 |  |  | 2,334,458 |  |  | $ | 1.15 |  |  |  | 3.2 |  |  | $ | 160 |
Shares available for grant |  |  | 450,900 |  |  |  |  |  |  |  |  |  |  |  |  |
The aggregate intrinsic value in the table above is based on our closing stock price of $0.60 | The aggregate intrinsic value in the table above is based on our closing stock price of $0.60 on the last business day for the year ended December 31, 2023.
|  | Years ended December 31, |
|  | 2023 |  |  | 2022 |
Shares exercised |  |  | 294,074 |  |  |  | 414,455 |
Total intrinsic value |  | $ | 195 |  |  | $ | 942 |
Cash received |  | $ | 154 |  |  | $ | 182 |

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