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v3.21.1

Stock Warrants (Tables) | 3 Months Ended
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Mar. 31, 2021
Stock Warrants |
Summary of all warrant activity | A summary of all warrant activity for the Company for the quarter ended March 31, 2021 and the year ended December 31, 2020 is as follows:
|  | Number of |  | Weighted Average
|  | Warrants |  | Exercise Price
Balance at December 31, 2019 |  | 18,714,999 |  |  | 3.24
Granted |  | — |  |  | —
Exercised |  | — |  |  | —
Forfeited |  | (714,286) |  |  | 50.05
Balance at December 31, 2020 |  | 18,000,713 |  | $ | 0.69
Granted |  | — |  |  | —
Exercised |  | 11,655,747 |  |  | 0.69
Forfeited |  | — |  |  | —
Balance at March 31, 2021 |  | 6,344,966 |  | $ | 0.69
Summary of all outstanding and exercisable warrants | A summary of all outstanding and exercisable common stock warrants as of March 31, 2021 is as follows:
|  |  |  |  |  |  | Weighted Average
|  |  | Warrants |  | Warrants |  | Remaining
Exercise Price |  | Outstanding |  | Exercisable |  | Contractual Life
$ | 0.69 |  | 6,344,252 |  | 6,344,252 |  | 2.53 years
| 18.20 |  | 714 |  | 714 |  | 1.74 years
$ | 0.69 |  | 6,344,966 |  | 6,344,966 |  | 2.53 years

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- Definition Tabular disclosure of warrant activity. + References No definition available. + Details
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Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- Definition Tabular disclosure relates to warrant outstanding and exercisable. + References No definition available. + Details
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Namespace Prefix: | syn_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | syn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration