XML 35 R19.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Summary of Significant Accounting Policies (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2017
Accounting Policies [Abstract] |
Estimated Useful Life Of Asset [Table Text Block] | The estimated useful life by asset description is noted in the following table.
Asset Description |  | Estimated Useful Life
Office equipment and furniture |  | 3 – 5 years
Manufacturing equipment |  | 10 years
Leasehold improvements and fixtures |  | Lesser of estimated useful life or lease term

X
- Definition Tabular disclosure of estimated useful life of assets. + References No definition available. + Details
Name: | syn_EstimatedUsefulLifeOfAssetTableTextBlock
Namespace Prefix: | syn_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration