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Note 9 - Stock-Based Compensation | 6 Months Ended
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Jun. 30, 2025
Notes to Financial Statements |
Share-Based Payment Arrangement [Text Block] | Note 9. Stock-Based Compensation We account for stock-based compensation in accordance with the provisions of ASC Topic 718, Compensation-Stock Compensation (“ASC 718”), which established accounting for stock-based awards exchanged for employee services. Stock-based compensation cost is measured at each grant date, based on the fair value of the award, and is recognized as expense over the employee’s requisite service period of the award. All of our stock compensation is accounted for as an equity instrument. In May 2015, our stockholders approved our 2015 Equity Incentive Plan (the “2015 Plan”). The 2015 Plan is a replacement of the 2007 Plan. The 399,562 share reserve of the 2007 Plan became the reserve of the 2015 Plan, together with 3,000,000 additional shares approved for issuance under the 2015 Plan. In May 2019, our stockholders approved 1,600,000 of additional shares for issuance under the 2015 Plan. In May 2021, our stockholders approved 3,600,000 of additional shares for issuance under the 2015 Plan. In May 2024, our stockholders approved an amendment to the 2015 Plan to increase the number of shares reserved for issuance by an additional 3,600,000 shares. In May 2025, our stockholders approved our 2025 Equity Incentive Plan (the “2025 Plan”). The 2025 Plan is a replacement of the 2015 Plan. The 4,313,156 share reserve of the 2015 Plan became the reserve of the 2025 Plan. Awards that may be made under the 2025 Plan are stock options, stock appreciation rights, restricted stock, restricted stock units, performance shares, performance units, deferred compensation awards and other stock-based awards. Stock options and stock appreciation rights awarded under the 2025 Plan may not be repriced without stockholder approval. Stock options and stock appreciation rights may not be granted below fair market value. Stock options or stock appreciation rights generally shall not be fully vested over a period of less than four years from the date of grant and cannot be exercised more than 10 years from the date of grant. Restricted stock, restricted stock units, and performance awards generally shall not vest faster than over a three-year period (or a twelve-month period if vesting is based on a performance measure). However, options granted to consultants and restricted stock awards granted to independent board members typically vest in one year and the 2025 Plan does allow for similar vesting to employees. The following table summarizes compensation costs related to our stock-based awards (in thousands, except per share data):
|  | Three Months Ended |  |  | Six Months Ended |
|  | June 30, |  |  | June 30, |
|  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
Cost of revenue |  | $ | 47 |  |  | $ | 68 |  |  | $ | 110 |  |  | $ | 173 |
Selling, general and administrative |  |  | 476 |  |  |  | 526 |  |  |  | 949 |  |  |  | 1,079 |
Research and development |  |  | 110 |  |  |  | 121 |  |  |  | 220 |  |  |  | 272 |
Net effect on net loss |  | $ | 633 |  |  | $ | 715 |  |  | $ | 1,279 |  |  | $ | 1,524 |
We did not capitalize any stock-based compensation to inventory as of June 30, 2025 and December 31, 2024 due to the immateriality of the amount. We estimate the fair value of stock options using the Black-Scholes option pricing model, consistent with the provisions of ASC 718. There were no options granted in the three and six months ended June 30, 2025 and 2024. The following table summarizes the stock option transactions during the six months ended June 30, 2025 (in thousands, except per share data):
|  |  |  |  |  |  |  |  |  | Weighted- |  |  |  |  |
|  |  |  |  |  |  |  |  |  | average |  |  |  |  |
|  |  |  |  |  | Weighted- |  |  | Remaining |  |  |  |  |
|  | Number of |  |  | average |  |  | Contractual |  |  | Aggregate |
|  | Options |  |  | Exercise |  |  | Life |  |  | Intrinsic |
Stock Options |  | Outstanding |  |  | Price |  |  | (in years) |  |  | Value |
Balance as of January 1, 2025 |  |  | 1,175 |  |  | $ | 5.16 |  |  |  | 3.16 |  |  | $ | — |
Granted |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Exercised |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Canceled and expired |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Balance as of June 30, 2025 |  |  | 1,175 |  |  | $ | 5.16 |  |  |  | 2.67 |  |  | $ | — |
Options exercisable as of June 30, 2025 |  |  | 1,175 |  |  | $ | 5.16 |  |  |  | 2.67 |  |  | $ | — |
The aggregate intrinsic value in the table above represents the total pretax intrinsic value, based on our closing price of $1.41 on March 31, 2025, which would have been received by the option holder had all option holders exercised their options on that date. Restricted stock awards A summary of activity related to restricted stock awards for the six months ended June 30, 2025 is presented below (in thousands, except per share data):
|  |  |  |  |  | Weighted- |
|  |  |  |  |  | Average |
|  |  |  |  |  | Grant Date |
Stock Awards |  | Shares |  |  | Share Value |
Non-vested as of January 1, 2025 |  |  | 1,541 |  |  | $ | 2.84 |
Granted |  |  | 589 |  |  | $ | 1.52 |
Vested |  |  | (198 | ) |  | $ | 3.94 |
Forfeited |  |  | (20 | ) |  | $ | 2.81 |
Non-vested as of June 30, 2025 |  |  | 1,912 |  |  | $ | 2.32 |
As of June 30, 2025, the unamortized compensation costs related to unvested restricted stock awards was approximately $3.7 million, which is to be amortized on a straight-line basis over a weighted-average period of approximately 1.4 years. At-Risk, Performance Shares In February 2024, the Company issued at-risk, performance shares classified as equity awards. Expense is recognized quarterly on a straight-line method over the requisite service period, based on the probability of achieving the specified financial performance metric, with changes in expectations recognized as an adjustment to earnings in the period of change. Compensation cost is not recognized for at-risk, performance shares that do not vest because service or performance conditions are not satisfied and any previously recognized compensation cost is reversed. At-risk, performance shares are eligible to receive dividend equivalents under the Company’s 2015 Equity Incentive Plan (the “Plan”), as determined by the Board of Directors. The Company will recognize forfeitures as they occur. The Company’s at-risk, performance shares are classified as equity and contain performance and service conditions that must be satisfied for an employee to receive the shares. The financial performance metric for the at-risk, performance shares issued in February 2024 is based upon the Company’s year-end actual results in 2024. All performance shares, if earned, are still subject to annual vesting over a four-year period, except that no shares are vested on the first anniversary because the performance measurement is based on year-end results for the year 2023 and 2024, respectively. The fair value of the at-risk, performance shares is determined based on the closing price of the Company’s common stock on the first day after the public issuance of the Company’s earnings release for the most recent fiscal quarter, following the Compensation Committee and Board of Directors approval, which is considered the grant date. The fair value per share of the at-risk, performance shares classified as equity awards granted in February 2024 and March 2023 was $2.28 and $3.71, respectively. On March 15, 2023, the Compensation Committee recommended, and the Board approved, the grant to Dr. Morris Young of 223,590 at-risk, performance shares under the Plan. On March 15, 2023, the Compensation Committee approved the grant to Gary Fischer of 77,600 at-risk, performance shares under the Plan. If the minimum financial metric for fiscal year 2023 is achieved, then based upon a performance formula, a corresponding portion of the 223,590 shares issued to Dr. Young would be eligible to vest and a corresponding portion of the 77,600 shares issued to Mr. Fischer would be eligible to vest. If the target financial metric was exceeded and an additional financial metric for fiscal year 2023 is achieved, then additional shares above the target number of shares are earned based on such performance formula and the maximum number of additional shares earned is capped at 100% of the target. If the minimum financial metric for fiscal year 2023 is not achieved, then these awards are forfeited. On February 20, 2024, the Compensation Committee met and certified that the minimum revenue metric for fiscal year 2023 was not achieved. Therefore, none of the at-risk performance shares became eligible to vest. On February 20, 2024, the Compensation Committee recommended, and the Board approved, the grant to Dr. Morris Young of 223,590 at-risk, performance shares under the Plan. On February 20, 2024, the Compensation Committee approved the grant to Gary Fischer of 77,600 at-risk, performance shares under the Plan. If the minimum financial metric for fiscal year 2024 is achieved, then based upon a performance formula, a corresponding portion of the 223,590 shares issued to Dr. Young would be eligible to vest and a corresponding portion of the 77,600 shares issued to Mr. Fischer would be eligible to vest. If the target financial metric is exceeded, then additional shares above the target number of shares are earned based on such performance formula and the maximum number of additional shares earned is capped at 100% of the target. If the minimum financial metric for fiscal year 2024 is not achieved, then these awards are forfeited. On February 18, 2025, the Compensation Committee met and certified that the year-over-year annual revenue growth rate achieved for fiscal year 2024, expressed as a percentage, was 200%. Therefore, the maximum number of at-risk performance shares became eligible to vest. A summary of the status of our unvested at-risk, performance shares as of June 30, 2025 is presented below (in thousands, except per share data):
|  |  |  |  |  | Weighted- |
|  |  |  |  |  | Average |
|  |  |  |  |  | Grant Date |
Stock Awards |  | Shares |  |  | Share Value |
Non-vested as of January 1, 2025 |  |  | 301 |  |  | $ | 2.28 |
Granted |  |  | 151 | (1) |  | $ | 2.23 |
Vested |  |  | (75 | ) |  | $ | 2.28 |
Forfeited |  |  | — |  |  | $ | — |
Non-vested as of June 30, 2025 |  |  | 377 |  |  | $ | 2.26 |
(1) | The number of shares presented assumes the achievement of 100% of a target financial performance metric to be determined by the Company’s Compensation Committee and will be subject to an at-risk, performance shares agreement.
As of June 30, 2025, there was $0.5 million of unrecognized compensation expense related to unvested at-risk, performance shares that is expected to be recognized over a weighted-average period of 1.6 years.

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