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Note 8 - Share-based Payment Awards | 3 Months Ended
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Mar. 31, 2026
Notes to Financial Statements |
Share-Based Payment Arrangement [Text Block] | Note 8 — Share-Based Payment Awards In November 2018, the Company’s stockholders and board of directors approved the 2018 Plan which succeeded the 2017 Plan. The 2018 Plan was amended by the board of directors in December 2020. The Company has granted RSAs, stock options and RSUs for its common stock under the 2017 Plan and 2018 Plan as detailed in the tables below. There were 1,301,548 shares available for future issuance under the 2018 Plan as of March 31, 2026. All stock options issued have been non-qualified stock options and the exercise price was the closing stock price of the Company's common stock on the date of grant. Non-qualified stock options typically have a ten-year life and non-qualified stock options that are expired, terminated, surrendered or canceled without having been fully exercised will be available for future awards under the 2018 Plan. In addition, the 2018 Plan provides that commencing January 1, 2019 and through January 1, 2028, the share reserve will be increased by 4% of the total number of shares outstanding as of the preceding December 31, subject to a reduction at the discretion of the Company’s board of directors. On January 1, 2025, the share reserve was increased by 1,068,323 shares based on the 26,709,084 shares of common stock outstanding at December 31, 2024. On January 1, 2026, the share reserve was increased by 1,081,882 shares based on the 27,047,061 shares of common stock outstanding at December 31, 2025.The exercise price for stock options granted is not less than the fair value of common stock as of the date of grant. The Company uses the closing stock price on the date of grant as the exercise price. For the three months ended March 31, 2026 and 2025, the Company’s total stock-based compensation expense was $1,518 and $1,200, respectively. Of these amounts, $1,469 and $1,161 were recorded in general and administrative (“G&A”) expenses during the three months ended March 31, 2026 and 2025, respectively, and $49 and $39 were recorded in research and development expenses for the three months ended March 31, 2026 and 2025, respectively. Stock Options The following table summarizes stock option activity during the three months ended March 31, 2026:
|  |  |  |  |  |  |  |  |  | Weighted |  |  |  |  |
|  |  |  |  |  | Weighted |  |  | Average |  |  |  |  |
|  |  |  |  |  | Average |  |  | Remaining |  |  | Aggregate |
|  |  |  |  |  | Exercise |  |  | Contractual |  |  | Intrinsic |
|  | Shares |  |  | Price |  |  | Term (Yrs) |  |  | Value |
Outstanding as of December 31, 2025 |  |  | 5,911,521 |  |  | $ | 5.35 |  |  |  |  |  |  |  |  |
Issued |  |  | 504,674 |  |  | $ | 16.01 |  |  |  |  |  |  |  |  |
Exercised |  |  | (272,597 | ) |  | $ | 5.13 |  |  |  |  |  |  |  |  |
Forfeited/Cancelled |  |  | — |  |  | $ | — |  |  |  |  |  |  |  |  |
Outstanding as of March 31, 2026 |  |  | 6,143,598 |  |  | $ | 6.24 |  |  |  | 6.2 |  |  | $ | 113,292 |
Options exercisable as of March 31, 2026 |  |  | 4,613,017 |  |  | $ | 5.04 |  |  |  | 5.4 |  |  | $ | 90,577 |
Options vested and expected to vest at March 31, 2026 |  |  | 6,143,597 |  |  | $ | 6.24 |  |  |  | 6.2 |  |  | $ | 113,292 |
The aggregate intrinsic value of stock options is calculated as the difference between the exercise price of the stock options and the fair value of the Company’s common stock at March 31, 2026 for those stock options that had strike prices lower than the fair value of the Company’s common stock. Stock based compensation related to stock options was $888 and $929 for the three-month periods ended March 31, 2026 and 2025, respectively. As of March 31, 2026, there was a total of $9,166 of unrecognized compensation costs related to non-vested stock option awards, which will be recognized over a weighted average period of approximately 3.0 years. During the three months ended March 31, 2026, the Company issued 272,597 shares of its common stock resulting from stock option exercises at a weighted average exercise price of $5.13 per share with an intrinsic value of $3,473. During the three months ended March 31, 2025, the Company issued 108,451 shares of its stock resulting from stock option exercises at a weighted average exercise price of $3.63 per share with an intrinsic value of $1,167. Restricted Stock Units (RSUs) The following table summarizes restricted stock unit activity during the three months ended March 31, 2026:
|  | Number of Units |  |  | Weighted Average Grant-Date Fair Value Per Unit |
Outstanding and unvested as of December 31, 2025 |  |  | 278,501 |  |  | $ | 9.57 |
Granted |  |  | 293,625 |  |  | $ | 15.47 |
Vested |  |  | (40,217 | ) |  | $ | 13.00 |
Forfeited |  |  | — |  |  | $ | — |
Outstanding and unvested as of March 31, 2026 |  |  | 531,909 |  |  | $ | 12.57 |
Stock-based compensation related to RSUs was $521 and $190 for the three-month periods ended March 31, 2026 and 2025, respectively. As of March 31, 2026, there was $6,054 of unrecognized stock-based compensation expense related to unvested RSUs, which will be recognized over a weighted average period of approximately 3.0 years. Employee Stock Purchase Plan The Company’s 2018 Employee Stock Purchase Plan (“ESPP”) provides for an initial reserve of 150,000 shares, and this reserve is automatically increased on January 1 of each year by the lesser of 1% of the outstanding shares of common stock at December 31 of the preceding year or 150,000 shares of the Company's common stock, subject to reduction at the discretion of the Company’s board of directors. As of March 31, 2026, there were 975,687 shares available for issuance under the ESPP. The annual offerings consist of two stock purchase periods, with the first purchase period ending in June and the second ending in December. The terms of the ESPP permit employees of the Company to use payroll deductions to purchase stock at a price per share that is at least the lesser of (1) 85% of the fair market value of a share of common stock on the first date of an offering or (2) 85% of the fair market value of a share of common stock on the date of purchase. After the offering period ends, subsequent twelve-month offering periods automatically commence over the term of the ESPP on the day that immediately follows the conclusion of the preceding offering, each consisting of two purchase periods approximately six months in duration. The terms of the ESPP provide a restart feature if the Company's stock price is lower at the end of a six-month period within the twelve-month offering period than it was at the beginning of the twelve-month offering period. The Company recorded an expense of $109 and $81 related to the ESPP during the three-month periods ended March 31, 2026 and 2025, respectively. As of March 31, 2026 and December 31, 2025, the accompanying Condensed Balance Sheets include $258 and $45, respectively, in accrued liabilities for employee ESPP contributions.

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