XML 87 R69.htm IDEA: XBRL DOCUMENT
v3.21.1

COMMITMENTS AND CONTINGENCIES, Underwriting Agreement (FY) (Details) | Sep. 17, 2020 USD ($) $ / shares shares
--- | ---
Underwriting Agreement [Abstract] |
Deferred underwriting fees | $ 8,050,000
Initial Public Offering [Member] |
Underwriting Agreement [Abstract] |
Underwriters deferred fee (in dollars per unit) | $ / shares | $ 0.35
Deferred underwriting fees | $ 8,050,000
Initial Public Offering [Member] | PIMCO [Member] |
Underwriting Agreement [Abstract] |
Units issued (in shares) | shares | 1,980,000

X
- Definition Per share amount of the gross proceeds of an Initial Public Offering paid to the underwriter. + References No definition available. + Details
Name: | sbg_DeferredUnderwriterFeeDiscountPerUnit
Namespace Prefix: | sbg_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

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

X
- Definition Amount of costs incurred and deferred for underwriting fees in connection with the offering of Units in Initial Public Offering and Private Placement of Warrants. + References No definition available. + Details
Name: | sbg_UnderwritingFeesDeferred
Namespace Prefix: | sbg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Number of new units issued during the period. Each Unit consists of one share of Class A common stock and one-half of one redeemable warrant. + References No definition available. + Details
Name: | sbg_UnitsIssuedDuringPeriodSharesNewIssues
Namespace Prefix: | sbg_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=us-gaap_IPOMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=sbg_PimcoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |