| Schedule of stock option activity |
| | | | | | | | | | | | | | | | | | Weighted | | | | | | | | Weighted | | Average | | Aggregate | | | | | Average | | Remaining | | Intrinsic | | | | | Exercise Price | | Contractual | | Value | | | Shares | | Per Share | | Life (years) | | (in thousands) | Outstanding, December 31, 2023 (Predecessor) | | 747,001 | | $ | 6.17 | | 7.45 | | $ | 72 | Forfeited | | (4,592) | | | 4.76 | | | | | | Outstanding, June 30, 2024 (Predecessor) | | 742,409 | | $ | 6.18 | | 6.95 | | $ | 4 | Vested and expected to vest, June 30, 2024 (Predecessor) | | 723,710 | | $ | 6.20 | | 6.92 | | $ | 4 | Vested and exercisable, June 30, 2024 (Predecessor) | | 537,222 | | $ | 6.45 | | 6.47 | | $ | 4 |
| | | | | | | | | | | | | | | | | | Weighted | | | | | | | | Weighted | | Average | | Aggregate | | | | | Average | | Remaining | | Intrinsic | | | | | Exercise Price | | Contractual | | Value | | | Shares | | Per Share | | Life (years) | | (in thousands) | Outstanding, December 31, 2024 (Successor) | | 7,587 | | $ | — | | — | | $ | — | Options granted | | 5,687,965 | | | 0.95 | | — | | | — | Outstanding, June 30, 2025 (Successor) | | 5,695,552 | | $ | 0.95 | | 9.69 | | $ | 2,004 | Options vested, June 30, 2025 (Successor) | | 573,253 | | $ | 0.87 | | 9.73 | | $ | 246 | Options vested and exercisable, June 30, 2025 (Successor) | | 5,695,552 | | $ | 0.95 | | 9.69 | | $ | 2,004 |
|
| Schedule of stock based compensation expense |
The following table summarizes the total stock-based compensation expense for the stock options expense recorded in the condensed consolidated statements of operations and comprehensive loss for the three and six months ended June 30, 2025 (Successor) and June 30, 2024 (Predecessor) (in thousands): | | | | | | | | | | | | | | | Three Months Ended June 30, | | Six Months Ended June 30, | | | 2025 | | 2024 | | 2025 | | 2024 | | | Successor | | Predecessor | | Successor | | Predecessor | Research and development | | $ | 79 | | $ | 15 | | $ | 88 | | $ | 29 | Selling, general, and administration | | | 155 | | | 96 | | | 364 | | | 192 | Total stock-based compensation expense | | $ | 234 | | $ | 111 | | $ | 452 | | $ | 221 |
|