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v3.25.4

Revenues - Additional Information (Details) | 12 Months Ended
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Dec. 31, 2025 Customer
Customer Concentration Risk | Revenue |
Product Information [Line Items] |
Number of customer whose revenue was 10% or more of consolidated revenue | 0

X
- Definition Number of Customer. + References No definition available. + Details
Name: | btsg_NumberOfCustomer
Namespace Prefix: | btsg_
Data Type: | xbrli:integerItemType
Balance Type: | na
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_ProductInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_ConcentrationRiskByTypeAxis=us-gaap_CustomerConcentrationRiskMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_SalesRevenueNetMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |