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v2.4.1.9

Stock Purchase Warrants (Details) (Stock Warrants [Member], USD $) | 0 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 10, 2014 | Mar. 31, 2015 | Dec. 31, 2014
Stock Warrants [Member] |  |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |  |
Closing stock price | $ 1.75 us-gaap_SharePrice / us-gaap_FairValueByLiabilityClassAxis = syn_StockWarrantsMember | $ 2.19 us-gaap_SharePrice / us-gaap_FairValueByLiabilityClassAxis = syn_StockWarrantsMember | $ 1.46 us-gaap_SharePrice / us-gaap_FairValueByLiabilityClassAxis = syn_StockWarrantsMember
Expected dividends | 0.00%us-gaap_FairValueAssumptionsExpectedDividendRate / us-gaap_FairValueByLiabilityClassAxis = syn_StockWarrantsMember | 0.00%us-gaap_FairValueAssumptionsExpectedDividendRate / us-gaap_FairValueByLiabilityClassAxis = syn_StockWarrantsMember | 0.00%us-gaap_FairValueAssumptionsExpectedDividendRate / us-gaap_FairValueByLiabilityClassAxis = syn_StockWarrantsMember
Expected volatility | 95.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate / us-gaap_FairValueByLiabilityClassAxis = syn_StockWarrantsMember | 90.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate / us-gaap_FairValueByLiabilityClassAxis = syn_StockWarrantsMember | 90.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate / us-gaap_FairValueByLiabilityClassAxis = syn_StockWarrantsMember
Risk free interest rate | 1.39%us-gaap_FairValueAssumptionsRiskFreeInterestRate / us-gaap_FairValueByLiabilityClassAxis = syn_StockWarrantsMember | 1.26%us-gaap_FairValueAssumptionsRiskFreeInterestRate / us-gaap_FairValueByLiabilityClassAxis = syn_StockWarrantsMember | 1.59%us-gaap_FairValueAssumptionsRiskFreeInterestRate / us-gaap_FairValueByLiabilityClassAxis = syn_StockWarrantsMember
Expected life of warrant | 5 years | 4 years 6 months 18 days | 4 years 9 months 14 days

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- Definition Expected dividends to be paid to holders of the underlying shares or financial instruments (expressed as a percentage of the share or instrument's price). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Period the instrument, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Risk-free interest rate assumption used in valuing an instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Price of a single share of a number of saleable stocks of a company. + References No definition available. + Details
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