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v3.20.4

Proxy Contest and Related Costs (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Jun. 30, 2020 director board_member
Other Income and Expenses [Abstract] |  |  |
Number of board members re-elected | board_member |  |  | 5
Number of board members | board_member |  |  | 8
Number of directors elected | director |  |  | 3
Number of directors | director |  |  | 8
Proxy contest costs | $ | $ 3,105 | $ 0 |

X
- Definition Number of Board Members + References No definition available. + Details
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Namespace Prefix: | synl_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number Of Board Members Re-Elected + References No definition available. + Details
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Namespace Prefix: | synl_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of Directors + References No definition available. + Details
Name: | synl_NumberOfDirectors
Namespace Prefix: | synl_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number Of Directors Elected + References No definition available. + Details
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Namespace Prefix: | synl_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Proxy Contest Costs + References No definition available. + Details
Name: | synl_ProxyContestCosts
Namespace Prefix: | synl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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