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Collaboration Agreements - Shenyang Sunshine Pharmaceutical Co., Ltd (Narrative) (Details) - 3SBio License $ in Millions | 3 Months Ended
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Mar. 31, 2021 USD ($)
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |
Aggregate amount of upfront and milestone-based payments | $ 7.0
Aggregate amount for future payments upon achievement of clinical and regulatory approval milestones for products containing ImmTOR platform | $ 15.0

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- Definition Aggregate Amount For Future Payments Upon Achievement Of Clinical And Regulatory Approval Milestones For Products Containing ImmTOR Platform + References No definition available. + Details
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Period Type: | duration

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- Definition Aggregate Amount Of Upfront And Milestone Based Payments Paid + References No definition available. + Details
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Namespace Prefix: | selb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Balance Type: | na
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- Details
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