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

X

- 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

X

- 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

X

- Details

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