XML 37 R41.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

Stock-Based Compensation and Warrants - Summary of all outstanding and exercisable warrants (Details) | 12 Months Ended
--- | ---
Dec. 31, 2019 $ / shares shares
Exercise Price 1.38 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Exercise Price | $ / shares | $ 1.38
Warrants Outstanding | 17,999,999
Warrants Exercisable | 17,999,999
Weighted Average Remaining Contractual Life (in years) | 3 years 9 months 11 days
Exercise Price 18.20 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Exercise Price | $ / shares | $ 18.20
Warrants Outstanding | 714
Warrants Exercisable | 714
Weighted Average Remaining Contractual Life (in years) | 2 years 11 months 27 days
Exercise Price 50.05 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Exercise Price | $ / shares | $ 50.05
Warrants Outstanding | 714,286
Warrants Exercisable | 714,286
Weighted Average Remaining Contractual Life (in years) | 10 months 17 days
Exercise Price 5248 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Exercise Price | $ / shares | $ 3.24
Warrants Outstanding | 18,714,999
Warrants Exercisable | 18,714,999
Weighted Average Remaining Contractual Life (in years) | 3 years 8 months 1 day

X
- Definition The value as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the share warrants plan. + References No definition available. + Details
Name: | syn_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsWarrantsExercisableNumber
Namespace Prefix: | syn_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Exercise price of the warrants. + References No definition available. + Details
Name: | syn_WarrantsExercisePrice
Namespace Prefix: | syn_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageRemainingContractualTerms
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of equity instruments other than options outstanding, including both vested and non-vested instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(ii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=syn_ExercisePrice138Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=syn_ExercisePrice1820Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=syn_ExercisePrice5005Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=syn_ExercisePrice5248Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |