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Stock-Based Compensation - Narrative (Details) - USD ($) |  |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
May 21, 2024 | Jul. 23, 2021 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Mar. 20, 2025 | Dec. 31, 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Vesting period (in years) | 13 months |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  | 2,362,294 |  |  |
Exercise price (in dollars per share) |  |  |  |  | $ 1.99 |  |  |
Outstanding options (in shares) |  |  | 8,326,193 |  | 8,326,193 |  |  | 6,382,149
Stock-based compensation expense | $ 600,000 |  | $ 1,456,080 | $ 1,640,116 | $ 4,673,290 | $ 4,776,623 |  |
Grant date weighted average fair value (in dollars per share) |  |  |  |  | $ 1.99 |  |  |
General and Administrative and Research and Development Expense |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Stock-based compensation expense |  |  | 32,000 | 84,000 | $ 193,000 | 120,000 |  |
Vested Repriced Option |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Stock-based compensation expense | 200,000 |  |  |  |  |  |  |
Unvested Repriced Option |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Stock-based compensation expense | $ 400,000 |  |  |  |  |  |  |
Incentive Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Vesting period (in years) |  |  |  |  | 4 years |  |  |
Stock-based compensation expense |  |  | 1,456,080 | $ 1,640,116 | $ 4,673,290 | $ 4,776,623 |  |
Compensation expense remaining to be recognized |  |  | $ 7,761,498 |  | $ 7,761,498 |  |  |
Compensation expense recognized over a weighted-average period (in years) |  |  |  |  | 2 years 5 months 1 day |  |  |
2021 Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Shares reserved for future issuance (in shares) |  |  | 969,941 |  | 969,941 |  |  |
Exercise price (in dollars per share) | $ 3.01 |  |  |  |  |  |  |
Outstanding options (in shares) | 2,986,354 |  |  |  |  |  |  |
2021 Plan | Maximum |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Shares reserved for future issuance (in shares) |  | 2,590,000 |  |  |  |  |  |
Aggregate number of shares outstanding (as a percent) |  | 4.00% |  |  |  |  |  |
2021 Plan | Maximum | Class A Common Stock |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Granted (in shares) |  | 15,350,000 |  |  |  |  |  |
2021 ESPP | Class A Common Stock |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Shares reserved for future issuance (in shares) |  | 250,000 | 849,697 |  | 849,697 |  |  |
Aggregate number of shares outstanding (as a percent) |  | 1.00% |  |  |  |  |  |
Granted (in shares) |  |  |  |  | 530,911 |  |  |
2021 ESPP | Maximum | Class A Common Stock |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Granted (in shares) |  | 3,340,000 |  |  |  |  |  |
Inducement Award Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Shares reserved for future issuance (in shares) |  |  | 382,000 |  | 382,000 |  |  |
Inducement Award Plan | Maximum |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Shares reserved for future issuance (in shares) |  |  |  |  |  |  | 500,000 |

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