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REVENUE AND CONTRACT LIABILITY - Sales Returns Allowance (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
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Jun. 30, 2025 | Dec. 31, 2024
Revenue from Contract with Customer [Abstract] |  |
Beginning balance | $ 9,526 | $ 8,651
Additions to the allowance | 46,343 | 105,353
Deductions from the allowance | (47,623) | (104,478)
Ending balance | $ 8,246 | $ 9,526

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- Definition Deductions From Sales Returns, Current + References No definition available. + Details
Name: | byon_DeductionsFromSalesReturnsCurrent
Namespace Prefix: | byon_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition A valuation allowance for estimated sales returns. + References No definition available. + Details
Name: | byon_SalesReturnReserveForSalesReturnsCurrent
Namespace Prefix: | byon_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Sales Returns, Additions To Reserve For Sales Returns + References No definition available. + Details
Name: | byon_SalesReturnsAdditionsToReserveForSalesReturns
Namespace Prefix: | byon_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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