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Selected Balance Sheet Information (Details 2) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | ---
Accrued Expenses [Line Items] |  |
Accrued manufacturing costs | $ 247 syn_AccruedManufacturingCosts | $ 662 syn_AccruedManufacturingCosts
Accrued vendor payments | 176 syn_AccruedVendorPayments | 220 syn_AccruedVendorPayments
Accrued milestone payments | 350 syn_AccruedMilestonePayable | 0 syn_AccruedMilestonePayable
Accrued clinical consulting services | 525 syn_AccruedClinicalConsultingServices | 0 syn_AccruedClinicalConsultingServices
Total | $ 1,298 us-gaap_AccruedLiabilitiesCurrent | $ 882 us-gaap_AccruedLiabilitiesCurrent

X
- Definition The carrying value of accrued clinical consulting services payable as on balance sheet date. + References No definition available. + Details
Name: | syn_AccruedClinicalConsultingServices
Namespace Prefix: | syn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | syn_AccruedExpensesLineItems
Namespace Prefix: | syn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The manufacturing costs incurred in the production of goods for sale. + References No definition available. + Details
Name: | syn_AccruedManufacturingCosts
Namespace Prefix: | syn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The carrying value of accrued milestone payments payable as on balance sheet date. + References No definition available. + Details
Name: | syn_AccruedMilestonePayable
Namespace Prefix: | syn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Carrying value as of the balance sheet date of obligations and payables pertaining to vendor payments. + References No definition available. + Details
Name: | syn_AccruedVendorPayments
Namespace Prefix: | syn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_AccruedLiabilitiesCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant