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Segment Information (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2026
Segment Reporting [Abstract] |
Segment Reporting | The following table presents selected financial information about the Company's single operating segment for the three months ended March 31, 2026 and 2025 (in thousands):
| Three Months Ended March 31,
| 2026 |  | 2025
Program-specific expenses: |  |  |
Ulixacaltamide | $ | 19,103 |  |  | $ | 23,513 |
Vormatrigine | 20,494 |  |  | 13,733 |
Relutrigine | 12,854 |  |  | 5,377 |
Elsunersen | 3,197 |  |  | 761 |
Other early stage assets | 3,242 |  |  | 1,105 |
Personnel-related expenses | 17,730 |  |  | 13,030 |
Stock-based compensation expense | 17,112 |  |  | 8,786 |
Depreciation expense | 39 |  |  | 47 |
Other segment expenses(a) | 12,089 |  |  | 8,376 |
Other income, net | 13,299 |  |  | 5,432 |
Consolidated net loss | $ | (92,561) |  |  | $ | (69,296) |
(a) Other segment expenses includes research and development and general and administrative costs not attributable to a specific program.

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- Definition Tabular disclosure of segment reporting. Includes, but is not limited to, reconciliation of reportable segment amount to corresponding consolidated total. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 31 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-31 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 34 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-34 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-32 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 30 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-30 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 26C -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-26C Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 26B -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-26B Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 26A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-26A Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 25 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-25 Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-22 Reference 10: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-15 + Details
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