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Stockholders' Equity (Details Textual) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Stockholders Equity [Line Items] |  |  |
Proceeds from Stock Options Exercised | 4,000 us-gaap_ProceedsFromStockOptionsExercised | 231,000 us-gaap_ProceedsFromStockOptionsExercised |
Employee Stock Option [Member] |  |  |
Stockholders Equity [Line Items] |  |  |
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Exercises In Period | 6,583 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember | 291,666 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember | 374,851 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_OptionIndexedToIssuersEquityTypeAxis = us-gaap_EmployeeStockOptionMember
Cedars-Sinai Medical Center [Member] |  |  |
Stockholders Equity [Line Items] |  |  |
Stock Issued During Period, Shares, Acquisitions |  | 334,911 us-gaap_StockIssuedDuringPeriodSharesAcquisitions / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = syn_CedarssinaiMedicalCenterMember |
Equity Issued in Business Combination, Fair Value Disclosure |  | 425,000 us-gaap_EquityIssuedInBusinessCombinationFairValueDisclosure / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = syn_CedarssinaiMedicalCenterMember |
Sale of Stock for Channel Agreement Price, Per Share |  | 1.27 syn_SaleOfStockForChannelAgreementPricePerShare / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = syn_CedarssinaiMedicalCenterMember |
Warrant [Member] |  |  |
Stockholders Equity [Line Items] |  |  |
Stock Issued During Period Shares Cash less Warrant Exercises | 232,619 syn_StockIssuedDuringPeriodSharesCashLessWarrantExercises / us-gaap_StatementEquityComponentsAxis = us-gaap_WarrantMember |  |
IPO [Member] |  |  |
Stockholders Equity [Line Items] |  |  |
Stock Issued During Period, Shares, New Issues | 14,059,616 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_IPOMember |  |
Common Stock, Closing Price, Per Share | 1.47 syn_CommonStockClosingPricePerShare / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_IPOMember |  |
Noninterest Expense Offering Cost | 1,600,000 us-gaap_NoninterestExpenseOfferingCost / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_IPOMember |  |
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Exercises In Period |  | 291,667 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_IPOMember |
Proceeds from Issuance Initial Public Offering | 20,700,000 us-gaap_ProceedsFromIssuanceInitialPublicOffering / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_IPOMember |  |
Proceeds from Issuance or Sale of Equity | 19,100,000 us-gaap_ProceedsFromIssuanceOrSaleOfEquity / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_IPOMember |  |
Private Placement [Member] |  |  |
Stockholders Equity [Line Items] |  |  |
Stock Issued During Period, Shares, New Issues |  | 13,225,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_PrivatePlacementMember |
Common Stock, Closing Price, Per Share |  | 1.00 syn_CommonStockClosingPricePerShare / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_PrivatePlacementMember |
Noninterest Expense Offering Cost |  | 1,000,000 us-gaap_NoninterestExpenseOfferingCost / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_PrivatePlacementMember |
Proceeds from Issuance Initial Public Offering |  | 13,200,000 us-gaap_ProceedsFromIssuanceInitialPublicOffering / us-gaap_SubsidiarySaleOfStockAxis = us-gaap_PrivatePlacementMember |

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- Definition Fair value of equity issued in a business combination. + 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 (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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