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Restructuring | 9 Months Ended
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Sep. 30, 2024
Restructuring and Related Activities [Abstract] |
Restructuring | Restructuring In April 2023, in light of current market conditions, the Board of Directors took steps to extend the Company’s cash runway by pausing further development of SEL-302 for the treatment of MMA, and conducting a targeted headcount reduction. On August 17, 2023, the Company announced additional steps to extend cash runway and maximize value for stockholders by continuing to prioritize development of SEL-212 and support of its collaboration with Astellas for Xork, and pausing further development of all of the Company’s other clinical and preclinical product candidates that it was no longer actively advancing. As a result of these measures, the Company implemented a restructuring plan that resulted in an approximate 90% reduction of the Company's existing headcount as of September 30, 2024. The Company recognized restructuring expenses consisting of one-time cash severance payments and other employee-related costs of $6.4 million for the year ended December 31, 2023 with $5.6 million and $0.8 million recorded to research and development and general and administrative operating expense categories, respectively, on its consolidated statements of operations and comprehensive income (loss) based on each employee's role. Cash payments for employee related restructuring charges of $2.5 million were paid as of December 31, 2023. For the nine months ended September 30, 2024, the Company recorded restructuring expenses consisting of one-time cash severance payments and other employee-related costs of $0.8 million, with $0.2 million and $0.6 million recorded to research and development and general and administrative operating expense categories, respectively, on its consolidated statements of operations and comprehensive income (loss) based on each employee’s role. Cash payments for employee related restructuring charges of $4.6 million were paid during the nine months ended September 30, 2024. Payments for the restructuring plan were substantially complete by June 30, 2024. The following table summarizes the change in the Company’s accrued restructuring balance (in thousands):
| Beginning Balance |  |  |  |  |  | Ending Balance
| December 31, 2023 |  | Charges |  | Payments |  | September 30, 2024
Severance liability | $ | 3,896 |  |  | $ | 777 |  |  | $ | (4,586) |  |  | $ | 87 |

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- Definition The entire disclosure for restructuring and related activities. Description of restructuring activities such as exit and disposal activities, include facts and circumstances leading to the plan, the expected plan completion date, the major types of costs associated with the plan activities, total expected costs, the accrual balance at the end of the period, and the periods over which the remaining accrual will be settled. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4.e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479823/420-10-S99-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482017/420-10-50-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482017/420-10-50-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 420 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/420/tableOfContent Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 420 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482017/420-10-50-1 + Details
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