XML 104 R82.htm IDEA: XBRL DOCUMENT
v3.22.1

Benefit Plans and Collective Bargaining Agreements - Non-Union Employees Narrative (Details) - 401(k) Employee Stock Ownership Plan - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Defined Contribution Plan Disclosure [Line Items] |  |
Employee maximum contribution percentage | 100.00% |
Employee maximum contribution amount | $ 19,500 |
Minimum age to qualify under Economic Growth and Tax Relief Reconciliation Act | 50 years |
Employee additional contribution eligible under economic growth and tax relief reconciliation act | $ 6,500 |
Employee maximum contribution eligible under economic growth and tax relief reconciliation act | $ 26,000 |
Employer maximum contribution percentage match |  | 100.00%
Matching percentage by employer of employees' gross pay | 4.00% | 4.00%
Matching contributions made by employer | $ 700,000 | $ 400,000
Employer discretionary contribution | $ 0 | $ 0

X
- Definition Defined Contribution Plan, Additional Annual Contribution Per Employee, Amount Under Economic Growth and Tax Relief Reconciliation Act + References No definition available. + Details
Name: | synl_DefinedContributionPlanAdditionalAnnualContributionPerEmployeeAmountUnderEconomicGrowthAndTaxReliefReconciliationAct
Namespace Prefix: | synl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Defined Contribution Plan, Additional Annual Contribution Per Employee, Minimum Age Under Economic Growth and Tax Relief Reconciliation Act + References No definition available. + Details
Name: | synl_DefinedContributionPlanAdditionalAnnualContributionPerEmployeeMinimumAgeUnderEconomicGrowthAndTaxReliefReconciliationAct
Namespace Prefix: | synl_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Defined Contribution Plan, Maximum Annual Contribution Per Employee, Amount Under Economic Growth and Tax Relief Reconciliation Act + References No definition available. + Details
Name: | synl_DefinedContributionPlanMaximumAnnualContributionPerEmployeeAmountUnderEconomicGrowthAndTaxReliefReconciliationAct
Namespace Prefix: | synl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
Name: | us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- 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_DefinedContributionPlanDisclosureLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum amount the employee may contribute to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeeAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RetirementPlanNameAxis=synl_A401kEmployeeStockOwnershipPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |