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Fair Value of Financial Instruments (Additional Information) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2025 USD ($)
October 2023 Financing [Member]
Proceeds from exercise of warrants	$ 5.3

X

- Definition

The cash inflow associated with the amount received from holders exercising their stock warrants.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 14
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-14

+ Details

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

X

- Details

Name:	us-gaap_AwardDateAxis=sybx_October2023FinancingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: