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v3.22.0.1

Accumulated other comprehensive loss - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Equity [Abstract] |  |
Defined benefit plan adjustment | $ (32) | $ 4

X
- Definition Other Comprehensive (Income) Loss, Defined Benefit Plan, before Tax, after Reclassification Adjustment, Attributable to Equity Method Investment + References No definition available. + Details
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Namespace Prefix: | son_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration