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Stock-Based Compensation - Stock Option Activity (Details) - Employee Stock Option - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2024
Shares |  |  |  |  |
Outstanding, beginning of year (in shares) |  |  | 6,850,889 |  |
Granted (in shares) |  |  | 4,450,300 |  |
Exercised (in shares) | 0 |  | 0 |  |
Cancelled or forfeited (in shares) |  |  | (74,905) |  |
Expired (in shares) |  |  | (473) |  |
Outstanding, end of year (in shares) | 11,225,811 |  | 11,225,811 |  | 6,850,889
Vested and exercisable (in shares) | 3,570,804 |  | 3,570,804 |  |
Vested and expected to vest (in shares) | 11,225,811 |  | 11,225,811 |  |
Weighted-Average Exercise Price |  |  |  |  |
Outstanding, beginning of year (in dollars per share) |  |  | $ 13.75 |  |
Granted (in dollars per share) |  |  | 6.53 |  |
Cancelled or forfeited (in dollars per share) |  |  | 9.97 |  |
Expired (in dollars per share) |  |  | 682.65 |  |
Outstanding at end of year (in dollars per share) | $ 10.89 |  | 10.89 |  | $ 13.75
Vested and exercisable at end of year (in dollars per share) | 14.39 |  | 14.39 |  |
Vested and expected to vest at end of the year (in dollars per share) | $ 10.89 |  | $ 10.89 |  |
Weighted Average Remaining Contractual Term (years) |  |  |  |  |
Outstanding |  |  | 8 years 6 months 21 days |  | 8 years 3 months 21 days
Vested and exercisable |  |  | 7 years 2 months 19 days |  |
Vested and expected to vest |  |  | 8 years 6 months 21 days |  |
Aggregate Intrinsic Value |  |  |  |  |
Outstanding | $ 447 |  | $ 447 |  | $ 2,946
Vested and exercisable | 302 |  | 302 |  |
Vested and expected to vest | 447 |  | 447 |  |
Additional disclosures |  |  |  |  |
Intrinsic value of options exercised |  | $ 100 |  | $ 200 |
Aggregate fair value of options vested | $ 3,900 | $ 2,500 | $ 12,200 | $ 5,600 |
Weighted average grant date fair value of options granted (in dollars per share) | $ 3.75 | $ 6.64 | $ 4.56 | $ 9.95 |
Unrecognized compensation expense related to unvested stock option awards | $ 44,800 |  | $ 44,800 |  |
Weighted-average amortization period over which cost is expected to be recognized |  |  | 2 years 9 months 18 days |  |

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