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Subsequent Events (Details)	1 Months Ended
	Aug. 31, 2019 USD ($)
Clinical Trial Agreement [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Estimated Research Costs	$ 3,200,000

X

- Definition

Amount of estimated research services cost provided.

+ References

No definition available.

+ Details

Name:	syn_EstimatedResearchCosts
Namespace Prefix:	syn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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_TypeOfArrangementAxis=syn_ClinicalTrialAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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