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Stock-Based Compensation (Details 8) (USD $) | 12 Months Ended
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Dec. 31, 2014
Exercise Price 1.60 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Exercise Price | $ 1.60 syn_WarrantsExercisePrice / us-gaap_RangeAxis = syn_ExercisePrice14Member
Warrants Outstanding | 316,522 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber / us-gaap_RangeAxis = syn_ExercisePrice14Member
Warrants Exercisable | 316,522 syn_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsWarrantsExercisableNumber / us-gaap_RangeAxis = syn_ExercisePrice14Member
Weighted Average Remaining Contractual Life | 2 years 9 months 25 days
Exercise Price 1.75 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Exercise Price | $ 1.75 syn_WarrantsExercisePrice / us-gaap_RangeAxis = syn_ExercisePrice175Member
Warrants Outstanding | 7,029,808 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber / us-gaap_RangeAxis = syn_ExercisePrice175Member
Warrants Exercisable | 7,029,808 syn_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsWarrantsExercisableNumber / us-gaap_RangeAxis = syn_ExercisePrice175Member
Weighted Average Remaining Contractual Life | 4 years 9 months 11 days
Exercise Price 2.22 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Exercise Price | $ 2.22 syn_WarrantsExercisePrice / us-gaap_RangeAxis = syn_ExercisePrice222Member
Warrants Outstanding | 517,257 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber / us-gaap_RangeAxis = syn_ExercisePrice222Member
Warrants Exercisable | 517,257 syn_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsWarrantsExercisableNumber / us-gaap_RangeAxis = syn_ExercisePrice222Member
Weighted Average Remaining Contractual Life | 1 year 10 months 28 days
Exercise Price 3.30 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Exercise Price | $ 3.30 syn_WarrantsExercisePrice / us-gaap_RangeAxis = syn_ExercisePrice330Member
Warrants Outstanding | 61,207 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber / us-gaap_RangeAxis = syn_ExercisePrice330Member
Warrants Exercisable | 61,207 syn_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsWarrantsExercisableNumber / us-gaap_RangeAxis = syn_ExercisePrice330Member
Weighted Average Remaining Contractual Life | 4 months 28 days
Exercise Price 3.75 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Exercise Price | $ 3.75 syn_WarrantsExercisePrice / us-gaap_RangeAxis = syn_ExercisePrice375Member
Warrants Outstanding | 50,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber / us-gaap_RangeAxis = syn_ExercisePrice375Member
Warrants Exercisable | 50,000 syn_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsWarrantsExercisableNumber / us-gaap_RangeAxis = syn_ExercisePrice375Member
Weighted Average Remaining Contractual Life | 1 year 1 month 17 days
Exercise Price 1.99 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Exercise Price | $ 1.99 syn_WarrantsExercisePrice / us-gaap_RangeAxis = syn_ExercisePrice199Member
Warrants Outstanding | 7,974,794 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber / us-gaap_RangeAxis = syn_ExercisePrice199Member
Warrants Exercisable | 7,974,794 syn_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsWarrantsExercisableNumber / us-gaap_RangeAxis = syn_ExercisePrice199Member
Weighted Average Remaining Contractual Life | 4 years 5 months 16 days

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- 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
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- 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of equity instruments other than options outstanding, including both vested and non-vested instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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=6415400&loc=d3e5070-113901 + Details
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