XML 49 R39.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Subsequent Events (Details Textual) - USD ($) |  |  | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Oct. 15, 2018 | Oct. 10, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Jul. 28, 2018 | Dec. 31, 2017
Proceeds from Issuance or Sale of Equity |  |  | $ 6,422,000 | $ 6,358,000 |  |
Common Stock, Par or Stated Value Per Share |  |  | $ 0.001 |  | $ 0.001 | $ 0.001
Subsequent Event [Member] | October 2018 Warrants [Member] |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  | 2,428,825 |  |  |  |
Class of Warrant or Right Additional Number of Securities Called by Warrants or Rights |  | 1,807,826 |  |  |  |
Warrant Exercise Price Percentage on Public Offering Price |  | 120.00% |  |  |  |
Warrant Expiration Date |  | Oct. 15, 2023 |  |  |  |
Subsequent Event [Member] | Underwritten Public Offering [Member] |  |  |  |  |  |
Proceeds from Issuance or Sale of Equity | $ 18.6 |  |  |  |  |
Convertible Preferred Stock Shares to be Issued upon Conversion | 13,672,173 |  |  |  |  |
Subsequent Event [Member] | Underwritten Public Offering [Member] | October 2018 Warrants [Member] |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ 1.38 |  |  |  |  |
Warrant Term | 5 years |  |  |  |  |
Sale of Stock, Price Per Share | $ 1.15 |  |  |  |  |
Number of Warrants Issued | 13,672,173 |  |  |  |  |
Subsequent Event [Member] | Over-Allotment Option [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  | 2,428,825 |  |  |  |
Class A [Member] | Subsequent Event [Member] | Underwritten Public Offering [Member] |  |  |  |  |  |
Sale of Stock, Number of Shares Issued in Transaction | 2,520,000 |  |  |  |  |
Common Stock, Par or Stated Value Per Share | $ 0.001 |  |  |  |  |
Class B Units [Member] | Subsequent Event [Member] | Underwritten Public Offering [Member] |  |  |  |  |  |
Sale of Stock, Number of Shares Issued in Transaction | 15,723 |  |  |  |  |
Sale of Stock, Price Per Share | $ 1,000 |  |  |  |  |
Series B Preferred Stock [Member] | Subsequent Event [Member] | Underwritten Public Offering [Member] |  |  |  |  |  |
Preferred Stock Stated Value Per Share | 1,000 |  |  |  |  |
Preferred Stock Convertible Conversion Price | $ 1.15 |  |  |  |  |

X
- Definition Additional number of securities into which the class of warrant or right may be converted. + References No definition available. + Details
Name: | syn_ClassOfWarrantOrRightAdditionalNumberOfSecuritiesCalledByWarrantsOrRights
Namespace Prefix: | syn_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of shares to be issued for each share of convertible preferred stock that is converted. + References No definition available. + Details
Name: | syn_ConvertiblePreferredStockSharesToBeIssuedUponConversion
Namespace Prefix: | syn_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of warrants issued during the year. + References No definition available. + Details
Name: | syn_NumberOfWarrantsIssued
Namespace Prefix: | syn_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Per share conversion price of convertible preferred stock. + References No definition available. + Details
Name: | syn_PreferredStockConvertibleConversionPrice
Namespace Prefix: | syn_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer. + References No definition available. + Details
Name: | syn_PreferredStockStatedValuePerShare
Namespace Prefix: | syn_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition The percentage of exercise price of warrant on public offering price. + References No definition available. + Details
Name: | syn_WarrantExercisePricePercentageOnPublicOfferingPrice
Namespace Prefix: | syn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition It represents the expiration date of warrant. + References No definition available. + Details
Name: | syn_WarrantExpirationDate
Namespace Prefix: | syn_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the warrant term. + References No definition available. + Details
Name: | syn_WarrantTerm
Namespace Prefix: | syn_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
Name: | us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
Name: | us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Face amount or stated value per share of common stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_CommonStockParOrStatedValuePerShare
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition The cash inflow from the issuance of common stock, preferred stock, treasury stock, stock options, and other types of equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 + Details
Name: | us-gaap_ProceedsFromIssuanceOrSaleOfEquity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The number of shares issued or sold by the subsidiary or equity method investee per stock transaction. + References No definition available. + Details
Name: | us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction. + References No definition available. + Details
Name: | us-gaap_SaleOfStockPricePerShare
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=syn_OctoberTwoThousandEighteenWarrantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=syn_UnderwrittenPublicOfferingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=us-gaap_OverAllotmentOptionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=syn_ClassAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=syn_ClassBUnitsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_SeriesBPreferredStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |