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Segment Reporting (Tables) | 3 Months Ended
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Mar. 31, 2025
Segment Reporting |
Schedule of reportable segment profit and loss including significant expense categories | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended March 31,
​ |  | 2025 |  | 2024
Expenses(1): | ​ | ​ | ​ | ​ | ​ | ​
Research and development: | ​ | ​ | ​ | ​ | ​ | ​
Navenibart | ​ | $ | 11,829 | ​ | $ | 7,136
STAR-0310 | ​ |  | 7,436 | ​ |  | 2,975
Employee expenses | ​ |  | 4,650 | ​ |  | 3,437
General and administrative: | ​ |  | ​ | ​ |  | ​
Program support(2) | ​ |  | — | ​ |  | 75
Employee expenses | ​ |  | 3,524 | ​ |  | 2,862
Stock-based compensation expense | ​ |  | 3,839 | ​ |  | 2,754
Consulting and professional services expenses | ​ |  | 3,975 | ​ |  | 3,490
Other segment expenses(3) | ​ |  | 1,742 | ​ |  | 1,421
Other income, net(4) | ​ |  | (3,286) | ​ |  | (4,222)
Segment net loss | ​ | $ | 33,709 | ​ | $ | 19,928
(1)The significant expense categories and amounts align with segment level information that is regularly provided to the CODM. (2)General and administrative program support expense includes pre-commercial costs incurred in support of navenibart and STAR-0310, and patient advocacy costs incurred in support of navenibart and STAR-0310. (3)Other segment expense includes: costs incurred in support of overall research and development activities and non-specific programs, facilities expense, office expense, insurance expense and depreciation and amortization. (4)Other income, net, consists primarily of interest income on investments, as further described in Note 4, “Short-Term Investments”. For the three months ended March 31, 2025 and 2024, the Company recognized interest income of $3.3 million and $4.2 million, respectively.

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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-25 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-22 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-30 + Details
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