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v3.26.1

Segment Information (Tables) | 6 Months Ended
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Jun. 30, 2026
Segment Reporting [Abstract] |
Schedule of Segment Reporting | The following table presents selected financial information about the Company's single operating segment for the three and six months ended June 30, 2026 and 2025 (in thousands):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2026 |  | 2025 |  | 2026 |  | 2025
Program-specific expenses: |  |  |  |  |  |  |
Ulixacaltamide | $ | 13,299 |  |  | $ | 18,385 |  |  | $ | 32,402 |  |  | $ | 41,898 |
Vormatrigine | 12,878 |  |  | 17,957 |  |  | 33,372 |  |  | 31,690 |
Relutrigine | 13,979 |  |  | 10,509 |  |  | 26,833 |  |  | 15,886 |
Elsunersen | 8,141 |  |  | 1,317 |  |  | 11,338 |  |  | 2,078 |
Other early stage assets | 5,471 |  |  | 1,417 |  |  | 8,713 |  |  | 2,522 |
Personnel-related expenses | 18,943 |  |  | 11,913 |  |  | 36,673 |  |  | 24,943 |
Stock-based compensation expense | 11,309 |  |  | 7,770 |  |  | 28,421 |  |  | 16,556 |
Depreciation expense | 33 |  |  | 46 |  |  | 72 |  |  | 93 |
Other segment expenses(a) | 12,851 |  |  | 6,753 |  |  | 24,940 |  |  | 15,129 |
Other income, net | 13,184 |  |  | 4,940 |  |  | 26,483 |  |  | 10,372 |
Consolidated net loss | $ | (83,720) |  |  | $ | (71,127) |  |  | $ | (176,281) |  |  | $ | (140,423) |
(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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