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v3.25.2

Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
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Office and Laboratory Lease [Member] |  |
Commitment And Contingencies [Line Items] |  |
Letter of credit outstanding amount | $ 1.9 | $ 2.0

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- Definition Commitment And Contingencies [Line Items] + References No definition available. + Details
Name: | sldb_CommitmentAndContingenciesLineItems
Namespace Prefix: | sldb_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_LeaseContractualTermAxis=sldb_OfficeAndLaboratoryLeaseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |