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Summary of Significant Accounting Policies (Details Textual) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Summary of Significant Accounting Policies [Line Items] |  |  |  |
Depreciation | $ 20,000 us-gaap_Depreciation | $ 43,000 us-gaap_Depreciation | $ 63,000 us-gaap_Depreciation |
Goodwill, Impairment Loss | 0 us-gaap_GoodwillImpairmentLoss | 121,000 us-gaap_GoodwillImpairmentLoss | 47,000 us-gaap_GoodwillImpairmentLoss |
Cash and Cash Equivalents, at Carrying Value | 17,525,000 us-gaap_CashAndCashEquivalentsAtCarryingValue | 14,625,000 us-gaap_CashAndCashEquivalentsAtCarryingValue | 9,954,000 us-gaap_CashAndCashEquivalentsAtCarryingValue | 6,678,000 us-gaap_CashAndCashEquivalentsAtCarryingValue
Equity Method Investment, Ownership Percentage | 80.00%us-gaap_EquityMethodInvestmentOwnershipPercentage |  |  |
Noncontrolling Interest, Ownership Percentage by Parent | 20.00%us-gaap_MinorityInterestOwnershipPercentageByParent |  |  |
Warrant [Member] |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 7,974,794 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_FinancialInstrumentAxis = us-gaap_WarrantMember | 1,632,501 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_FinancialInstrumentAxis = us-gaap_WarrantMember | 1,632,501 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_FinancialInstrumentAxis = us-gaap_WarrantMember |
Fair Value Assumptions, Exercise Price | $ 1.46 us-gaap_FairValueAssumptionsExercisePrice / us-gaap_FinancialInstrumentAxis = us-gaap_WarrantMember |  |  |
Fair Value Assumptions, Expected Term | 4 years 9 months 18 days |  |  |
Fair Value Assumptions, Expected Volatility Rate | 90.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate / us-gaap_FinancialInstrumentAxis = us-gaap_WarrantMember |  |  |
Fair Value Assumptions, Risk Free Interest Rate | 1.59%us-gaap_FairValueAssumptionsRiskFreeInterestRate / us-gaap_FinancialInstrumentAxis = us-gaap_WarrantMember |  |  |
Options [Member] |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 5,981,106 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_DerivativeByNatureAxis = us-gaap_OptionMember | 3,909,580 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_DerivativeByNatureAxis = us-gaap_OptionMember | 4,453,746 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_DerivativeByNatureAxis = us-gaap_OptionMember |
Money Market Accounts and Mutual Funds [Member] |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |
Cash and Cash Equivalents, at Carrying Value | $ 13,600,000 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis = syn_MoneyMarketAccountsAndMutualFundsMember | $ 11,000,000 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsAxis = syn_MoneyMarketAccountsAndMutualFundsMember |  |

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Antidilution -URI http://asc.fasb.org/extlink&oid=6505113 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Diluted Earnings Per Share -URI http://asc.fasb.org/extlink&oid=6510752 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Contingent Stock Agreement -URI http://asc.fasb.org/extlink&oid=6508534 + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3044-108585 + Details
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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13777-109266 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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