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Property, Plant and Equipment (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Property, Plant and Equipment [Line Items] |  |
Total property, plant and equipment, gross | $ 106,201 | $ 105,497
Less accumulated deprecation | 66,815 | 64,807
Property, plant and equipment, net | 39,386 | 40,690
Land |  |
Property, Plant and Equipment [Line Items] |  |
Total property, plant and equipment, gross | 63 | 63
Leasehold improvements |  |
Property, Plant and Equipment [Line Items] |  |
Total property, plant and equipment, gross | 2,055 | 1,921
Buildings |  |
Property, Plant and Equipment [Line Items] |  |
Total property, plant and equipment, gross | 214 | 214
Machinery, fixtures and equipment |  |
Property, Plant and Equipment [Line Items] |  |
Total property, plant and equipment, gross | 100,832 | 100,300
Construction in progress |  |
Property, Plant and Equipment [Line Items] |  |
Total property, plant and equipment, gross | $ 3,037 | $ 2,999

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- Definition Property, Plant, And Equipment And Finance Lease Right-Of-Use Asset, Accumulated Depreciation And Amortization + References No definition available. + Details
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Namespace Prefix: | synl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Property, Plant, And Equipment And Finance Lease Right-Of-Use Asset, After Accumulated Depreciation And Amortization + References No definition available. + Details
Name: | synl_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization
Namespace Prefix: | synl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Property, Plant, And, Equipment And Finance Lease Right-Of-Use Asset, Before Accumulated Depreciation And Amortization + References No definition available. + Details
Name: | synl_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization
Namespace Prefix: | synl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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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
Name: | us-gaap_PropertyPlantAndEquipmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_LandMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_LandImprovementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_BuildingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_MachineryAndEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_ConstructionInProgressMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |