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Selected Balance Sheet Information - Schedule of ACCRUED EXPENSES (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Selected Balance Sheet Information |  |
Accrued vendor payments | $ 1,028 | $ 225
Accrued clinical consulting services | 696 | 700
Accrued manufacturing costs | 204 |
Total | $ 1,928 | $ 925

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- Definition The carrying value of accrued clinical consulting services payable as on balance sheet date. + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

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- Definition The manufacturing costs incurred in the production of goods for sale. + References No definition available. + Details
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- Definition Carrying value as of the balance sheet date of obligations and payables pertaining to vendor payments. + References No definition available. + Details
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Namespace Prefix: | syn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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