Lessee, Operating Lease, Number Of Renewal Options

No definition available.

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Namespace Prefix:	snti_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Lessor, Operating Lease, Sublease Payments To Be Received

+ References

No definition available.

+ Details

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Namespace Prefix:	snti_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481990/310-10-45-2

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- 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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 7A
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478964/842-20-50-7A

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478964/842-20-50-3

+ Details

Name:	us-gaap_LesseeLeaseDescriptionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478964/842-20-50-3

+ Details

Name:	us-gaap_LesseeOperatingLeaseRenewalTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

- Definition

Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

+ Details

Name:	us-gaap_LesseeOperatingLeaseTermOfContract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of lease payments to be received by lessor for operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479773/842-30-50-12

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

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Namespace Prefix:
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Balance Type:
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- Details

Name:	srt_CounterpartyNameAxis=snti_GeneFabMember
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Data Type:	na
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Period Type:

- Details

Name:	us-gaap_LeaseContractualTermAxis=snti_CorporateHeadquartersMember
Namespace Prefix:
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Balance Type:
Period Type:

- Details

Name:	srt_CounterpartyNameAxis=snti_BKPBIOTECHInc.AndJLSA2TherapeuticsInc.Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LeaseContractualTermAxis=snti_AlamedaMember
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Operating Leases - Narrative (Details) $ in Thousands	6 Months Ended
Operating Leases - Narrative (Details) $ in Thousands	Jun. 30, 2025 USD ($) tradingDay	Dec. 31, 2024 USD ($)	Jun. 12, 2024 USD ($)	Aug. 07, 2023 USD ($)
Lessee, Lease, Description [Line Items]
Total undiscounted sublease payments	$ 36,654
Related Party
Lessee, Lease, Description [Line Items]
Accounts receivable	3,524	$ 1,646
GeneFab \| Related Party
Lessee, Lease, Description [Line Items]
Accounts receivable	$ 2,900	$ 1,000
Corporate Headquarters
Lessee, Lease, Description [Line Items]
Operating lease, term of contract (in years)	8 years
Lease renewal term (in years)	8 years
Corporate Headquarters \| GeneFab
Lessee, Lease, Description [Line Items]
Total undiscounted sublease payments			$ 1,300
Corporate Headquarters \| BKPBIOTECH, Inc. and JLSA2 Therapeutics, Inc.
Lessee, Lease, Description [Line Items]
Sublease income to be earned	$ 1,300
Alameda
Lessee, Lease, Description [Line Items]
Operating lease, term of contract (in years)	11 years
Lease renewal term (in years)	5 years
Number of renewal options \| tradingDay	2
Alameda \| GeneFab
Lessee, Lease, Description [Line Items]
Total undiscounted sublease payments				$ 44,100