Name:	syn_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOptionsForfeitedInPeriod
Namespace Prefix:	syn_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

Weighted average fair value as of the grant date of equity-based award plans including stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

No definition available.

Name:	syn_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOptionsForfeituresWeightedAverageGrantDateFairValue
Namespace Prefix:	syn_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

The number of grants made during the period including stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

No definition available.

Name:	syn_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOptionsGrantsInPeriod
Namespace Prefix:	syn_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

The weighted average fair value at grant date for nonvested equity-based awards issued during the period including stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

No definition available.

Name:	syn_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
Namespace Prefix:	syn_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

The number of non-vested equity-based payment instruments, including stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

No definition available.

Name:	syn_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOptionsNonvestedNumber
Namespace Prefix:	syn_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

The weighted average fair value of nonvested awards on equity-based plans including option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

No definition available.

Name:	syn_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOptionsNonVestedWeightedAverageGrantDateFairValue
Namespace Prefix:	syn_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

The number of equity-based payment instruments, including stock (or unit) options, that vested during the reporting period.

No definition available.

Name:	syn_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOptionsVestedInPeriod
Namespace Prefix:	syn_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

The weighted average fair value as of grant date pertaining to an equity-based award plan including stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

No definition available.

Name:	syn_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOptionVestedInPeriodWeightedAverageGrantDateFairValue
Namespace Prefix:	syn_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (e)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901