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Commitments and Contingences - Narrative (Details)	Mar. 31, 2023 USD ($) ft²	Dec. 31, 2022 USD ($)
Commitments And Contingencies [Line Items]
Indemnification liability | $	$ 0	$ 0
Office and laboratory space
Commitments And Contingencies [Line Items]
Number of square feet under lease | ft²	24,300

X

- Definition

Commitments And Contingencies [Line Items]

+ References

No definition available.

+ Details

Name:	sera_CommitmentsAndContingenciesLineItems
Namespace Prefix:	sera_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of indemnification liability.

+ References

No definition available.

+ Details

Name:	sera_IndemnificationLiability
Namespace Prefix:	sera_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The area of leased office and laboratory space.

+ References

No definition available.

+ Details

Name:	sera_LesseeOperatingLeaseAreaOfLeasedSpaceOfficeAndLaboratory
Namespace Prefix:	sera_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=sera_OfficeAndLaboratorySpaceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: