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Stock Warrants - Summary of all warrant activity (Details) | 9 Months Ended
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Sep. 30, 2021 $ / shares shares
Stock Warrants |
Number of Warrants, Beginning Balance | shares | 18,000,713
Number of Warrants, Exercised | shares | 11,655,747
Number of Warrants, Ending Balance | shares | 6,344,966
Weighted Average Exercise Price, Beginning Balance | $ / shares | $ 0.69
Weighted Average Exercise Price, Exercised | $ / shares | 0.69
Weighted Average Exercise Price, Ending Balance | $ / shares | $ 0.69

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- Definition Number of share warrants exercised during the period. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans are exercise in period. + References No definition available. + Details
Name: | syn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOtherThanOptionsExercisesInPeriodWeightedAverageGrantDateFairValue
Namespace Prefix: | syn_
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- References No definition available. + Details
Name: | syn_StockWarrantsAbstract
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Balance Type: | na
Period Type: | duration

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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + 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)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant