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Related-Party Transactions - Additional Information (Detail) - Ginkgo Bioworks, Inc. - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 | Dec. 31, 2019
Related Party Transaction [Line Items] |  |
Prepayment to related party for collaboration agreement | $ 30.0 |
Related party transaction collaboration agreement, initial term | 5 years |
Current Pre-Paid Research and Development |  | $ 11.5
Non Current Pre-Paid Research and Development |  | 15.7
Prepaid research and development expenses |  | $ 2.8

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- Definition Current Pre-Paid Research and Development. + References No definition available. + Details
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Namespace Prefix: | sybx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Non Current Pre-Paid Research and Development + References No definition available. + Details
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Namespace Prefix: | sybx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Prepaid research and development expenses. + References No definition available. + Details
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Namespace Prefix: | sybx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Prepayment to related party for collaboration agreement. + References No definition available. + Details
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Namespace Prefix: | sybx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Related party transaction collaboration agreement, initial term. + References No definition available. + Details
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Namespace Prefix: | sybx_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |