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v3.21.1

FAIR VALUE MEASUREMENTS, Warrants (FY) (Details) - shares | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Public Warrants [Member] |  |
Warrants [Abstract] |  |
Warrants outstanding (in shares) | 11,500,000 | 11,500,000
Private Placement Warrants [Member] |  |
Warrants [Abstract] |  |
Warrants outstanding (in shares) | 6,600,000 | 6,600,000

X
- Definition Number of warrants or rights outstanding. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=sbg_PrivatePlacementWarrantMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |