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Stock Purchase Warrants (Details 3) (USD $)
3 Months Ended
Mar. 31, 2015
Exercise Price 1.60 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Exercise Price $ 1.60syn_WarrantsExercisePrice
/ us-gaap_RangeAxis
= syn_ExercisePrice14Member
Warrants Outstanding 316,522us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber
/ us-gaap_RangeAxis
= syn_ExercisePrice14Member
Warrants Exercisable 316,522syn_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsWarrantsExercisableNumber
/ us-gaap_RangeAxis
= syn_ExercisePrice14Member
Weighted Average Remaining Contractual Life 2 years 6 months 25 days
Aggregate Intrinsic value $ 187,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding
/ us-gaap_RangeAxis
= syn_ExercisePrice14Member
Exercise Price 1.75 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Exercise Price $ 1.75syn_WarrantsExercisePrice
/ us-gaap_RangeAxis
= syn_ExercisePrice175Member
Warrants Outstanding 7,029.808us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber
/ us-gaap_RangeAxis
= syn_ExercisePrice175Member
Warrants Exercisable 7,029,808syn_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsWarrantsExercisableNumber
/ us-gaap_RangeAxis
= syn_ExercisePrice175Member
Weighted Average Remaining Contractual Life 4 years 6 months 11 days
Aggregate Intrinsic value 3,903,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding
/ us-gaap_RangeAxis
= syn_ExercisePrice175Member
Exercise Price 2.22 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Exercise Price $ 2.22syn_WarrantsExercisePrice
/ us-gaap_RangeAxis
= syn_ExercisePrice222Member
Warrants Outstanding 517,257us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber
/ us-gaap_RangeAxis
= syn_ExercisePrice222Member
Warrants Exercisable 517,257syn_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsWarrantsExercisableNumber
/ us-gaap_RangeAxis
= syn_ExercisePrice222Member
Weighted Average Remaining Contractual Life 1 year 7 months 28 days
Aggregate Intrinsic value 0us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding
/ us-gaap_RangeAxis
= syn_ExercisePrice222Member
Exercise Price 3.30 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Exercise Price $ 3.30syn_WarrantsExercisePrice
/ us-gaap_RangeAxis
= syn_ExercisePrice330Member
Warrants Outstanding 61,207us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber
/ us-gaap_RangeAxis
= syn_ExercisePrice330Member
Warrants Exercisable 61,207syn_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsWarrantsExercisableNumber
/ us-gaap_RangeAxis
= syn_ExercisePrice330Member
Weighted Average Remaining Contractual Life 1 month 28 days
Aggregate Intrinsic value 0us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding
/ us-gaap_RangeAxis
= syn_ExercisePrice330Member
Exercise Price 3.75 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Exercise Price $ 3.75syn_WarrantsExercisePrice
/ us-gaap_RangeAxis
= syn_ExercisePrice375Member
Warrants Outstanding 50,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber
/ us-gaap_RangeAxis
= syn_ExercisePrice375Member
Warrants Exercisable 50,000syn_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsWarrantsExercisableNumber
/ us-gaap_RangeAxis
= syn_ExercisePrice375Member
Weighted Average Remaining Contractual Life 10 months 17 days
Aggregate Intrinsic value 0us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding
/ us-gaap_RangeAxis
= syn_ExercisePrice375Member
Exercise Price 1.80 [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Exercise Price $ 1.80syn_WarrantsExercisePrice
/ us-gaap_RangeAxis
= syn_ExercisePrice180Member
Warrants Outstanding 7,974,794us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber
/ us-gaap_RangeAxis
= syn_ExercisePrice180Member
Warrants Exercisable 7,974,794syn_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsWarrantsExercisableNumber
/ us-gaap_RangeAxis
= syn_ExercisePrice180Member
Weighted Average Remaining Contractual Life 4 years 2 months 16 days
Aggregate Intrinsic value $ 3,280,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding
/ us-gaap_RangeAxis
= syn_ExercisePrice180Member