XML 106 R81.htm IDEA: XBRL DOCUMENT v3.19.1

Subsequent Events - Additional Information (Detail) $ in Millions	Feb. 28, 2019 USD ($)
Subsequent Event | AbbVie
Subsequent Event [Line Items]
Remaining milestones achieved	$ 2.5

X

- Definition

Mile stones achieved.

+ References

No definition available.

+ Details

Name:	sybx_MileStonesAchieved
Namespace Prefix:	sybx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_TypeOfArrangementAxis=sybx_AbbVieAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: