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Contract Liabilities | 3 Months Ended
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Mar. 31, 2025
Revenue from Contract with Customer [Abstract] |
Contract Liabilities | # 7. Contract liabilities Contract liabilities represent the Group’s obligation to transfer services to a customer for which the Group has received advanced consideration, before the performance obligation has been satisfied. These liabilities are recognized when a customer prepays for services or when the Group has an unconditional right to consideration before the performance obligation is fulfilled. Contract liabilities comprise entirely of advance consideration received from customers (deferred revenue) in respect of the AstraZeneca research collaboration as of March 31, 2025. The current contract liabilities represent the amount of estimated revenue to be reported in the next 12 months related to amounts invoiced to its partners, while the non-current portion represents everything beyond 12 months. Current and non-current contract liabilities include future revenue from collaboration recharged expenses, upfront payments, and milestones achieved to March 31, 2025.
|  | March 31, 2025 |  |  | December 31, 2024 |
|  | $000s |  |  | $000s |
Contract liabilities: |  |  |  |  |  |
Current |  |  | 392 |  |  |  | 306 |
Non-current |  |  | 53,291 |  |  |  | 51,790 |
Total contract liabilities at period end |  |  | 53,683 |  |  |  | 52,096 |
Contract liabilities: |  |  |  |  |  |
At January 1, 2024 |  |  | 81,572 |  |  |  |
Foreign exchange impact |  |  | (691 | ) |  |  |
Additions during period |  |  | 14,328 |  |  |  |
Revenue unwound during period |  |  | (43,113 | ) |  |  |
At December 31, 2024 |  |  | 52,096 |  |  |  |
Contract liabilities: |  |  |  |  |  |
At January 1, 2025 |  |  | 52,096 |  |  |  |
Foreign exchange impact |  |  | 1,659 |  |  |  |
Additions during period |  |  | 70 |  |  |  |
Revenue unwound during period |  |  | (142 | ) |  |  |
At March 31, 2025 |  |  | 53,683 |  |  |  |

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- Definition Contract with Customer, Liability, + References No definition available. + Details
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Namespace Prefix: | sln_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_RevenueFromContractWithCustomerAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration