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Selected Balance Sheet Information (Details 2) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Accrued Expenses [Line Items] |  |
Accrued manufacturing costs | $ 0 | $ 247
Accrued vendor payments | 133 | 176
Accrued milestones payments | 0 | 350
Accrued clinical consulting services | 164 | 525
Total | $ 297 | $ 1,298

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

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

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