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Stock-based Compensation | 12 Months Ended
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Dec. 31, 2023
Share-based Payment Arrangement [Abstract] |
Stock-based Compensation | 8. Stock-based Compensation 2006 Equity Incentive Plan and Amendment to 2006 Plan Private CalciMedica adopted an equity incentive plan in 2006 (“2006 Plan”) that provides for the issuance of common stock to employees, non-employee directors and consultants. Recipients of incentive stock options are eligible to purchase common stock at an exercise price equal to no less than the estimated fair market value of such stock on the date of grant. The 2006 Plan provides for the grant of incentive stock options, non-statutory stock options and stock purchase rights. The maximum contractual term of options granted under the 2006 Plan is ten years. The options generally vest 25% on the first anniversary of the grant date, with the balance vesting ratably over the following 36 months. Pursuant to the Merger Agreement, Graybug assumed the 2006 Plan and all stock options issued and outstanding under the 2006 Plan. 2023 Equity Incentive Plan The Company adopted 2023 Equity Incentive Plan (the “2023 Plan”), which became effective at the closing of the Merger. As of the effective time of the Merger, there were 1,000,000 shares of the Company’s common stock available for grant under the 2023 Plan. In addition, the share reserve is subject to annual increases each January 1 for the first ten years following approval of the 2023 Plan of up to 5% of shares of the Company’s common stock outstanding (or a lesser number determined by the Company’s board of directors). As of December 31, 2023, 96,594 options have been returned but are unavailable for future grant under the 2006 Plan. As of December 31, 2023, 394,309 shares were available for grant under the 2023 Plan. 2023 Employee Stock Purchase Plan The Company adopted the 2023 Employee Stock Purchase Plan (the “2023 ESPP”) which became effective at the closing of the Merger. As of the effective time of the Merger, there were 65,000 shares of the Company’s common stock reserved for issuance under the 2023 ESPP. In addition, the share reserve is subject to annual increases each January 1 for the first ten years following approval of the 2023 ESPP of the lesser of (1) 1% of the total number of shares of the Company’s common stock outstanding on December 31 of the preceding calendar year, (2) 195,000 shares of the Company’s common stock, or (3) such lesser number of shares of the Company’s common stock as determined by the Company’s board of directors. As of December 31, 2023, no shares have been issued under the 2023 ESPP. The following table summarizes the stock option transactions for the 2006 and 2023 Plans:
|  | Total Options |  |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Term (years) |  |  |  | Aggregate Intrinsic Value (in thousands) |
Outstanding at December 31, 2022 |  |  | 739,511 |  |  | $ |  | 6.94 |  |  |  | 7.36 |  |  | $ |  | 8,903 |
Assumed in the Merger |  |  | 310,431 |  |  |  |  | 76.72 |  |  |  |  |  |  |  |
Granted |  |  | 785,922 |  |  |  |  | 6.48 |  |  |  |  |  |  |  |
Cancelled |  |  | (96,594 | ) |  |  |  | 70.51 |  |  |  |  |  |  |  |
Outstanding at December 31, 2023 |  |  | 1,739,270 |  |  | $ |  | 15.71 |  |  |  | 6.99 |  |  | $ |  | 76 |
Vested and exercisable at December 31, 2023 |  |  | 940,098 |  |  | $ |  | 6.18 |  |  |  | 5.97 |  |  | $ |  | 76 |
There were no options exercised during the year ended December 31, 2023. The weighted-average fair value of options granted during the years ended December 31, 2023 and 2022 was $2.34 and $12.85 per share, respectively. The total fair value of shares vested was $11.9 mill ion (which includes $10.5 million related to the acceleration of vesting of the Graybug stock awards at the date of the Merger) for the year ended December 31, 2023 and $1.7 million for the year ended December 31, 2022. As of December 31, 2023, stock-based compensation not yet recognized is $2.3 million, which the Company expects to recognize over an estimated weighted-average term of 2.4 years. The following is the range of underlying assumptions in Black-Scholes to determine the fair value of the stock option grants for the years ended December 31, 2023 and 2022:
|  | Year Ended December 31,
|  | 2023 |  |  | 2022
Risk free interest rate |  | 3.50%-3.56% |  |  | 2.80%-3.28%
Expected volatility |  | 75%-76% |  |  | 82%
Expected term (years) |  |  | 6.25 |  |  | 5.00-6.25
Expected dividend yield |  | 0% |  |  | 0%
Stock-based Compensation Expense Stock-based compensation expense recognized for options and restricted stock units granted was as follows (in thousands):
|  | Year Ended December 31, |
|  | 2023 |  |  | 2022 |
Research and development |  | $ | 2,449 |  |  | $ | 499 |
General and administrative |  |  | 9,590 |  |  |  | 902 |
Total |  |  | 12,039 |  |  |  | 1,401 |
Statement of convertible preferred stock and stockholders' equity (deficit) |  |  |  |  |  |
Settlement of 2021 and 2020 accrued bonus and employee costs |  |  | — |  |  |  | 406 |
Total stock-based compensation expense |  | $ | 12,039 |  |  | $ | 1,807 |
The stock-based compensation expense for the year ended December 31, 2023, includes one-time charges for the acceleration of vesting of the Graybug stock options at the date of the Merger of $1.9 million and $8.6 million in research and development and general and administrative expenses, respectively. Common Stock Reserved for Future Issuance Common stock reserved for future issuance consists of the following at December 31, 2023:
|  | December 31, |
|  | 2023 |
Common stock warrants |  |  | 276,437 |
Stock options issued and outstanding |  |  | 1,739,270 |
Shares available for issuance under the 2023 Plan |  |  | 394,309 |
Shares available under the 2023 ESPP |  |  | 65,000 |
Total |  |  | 2,475,016 |

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